Have you talked to her about your needs and goals? Maybe you should consider doing private lessons more related to what you want to achieve?

Dear Leilani,
The Student/Instructor relationship is a 50-50 deal.And four years is a very short time to have been dancing. The instructor offers what she offers and it is her job to be honest with her students as to the level of her ability as an instructor and as to what it is that she offers. EVERY instructor has a finite amount of material that she/he can offer the student. If your instructor peaks out at 4 years for most people, then that is the line where it is time for those who feel they are not getting anything else to move on in one way or another..... or to develop an attitude that they will continue to delve ever deeper into movements that any student can only understand to a certain extent after just 4 years of class. I have been studying for 35 years and teaching for almost as long. I take fundamentals classes with no problem because. like an onion, movement and other elements of dance have layers and layers and layers of depth. For serious dance students, the simplest of movements or ideas can take a long, long time to truly understand at that deepest level. I would suggest that if you like this woman as an instructor, that you continue to take her class and see if you can see what is beneath the obvious, if that makes sense. She may be aware of more than you are currently getting, or she may simply have reached the full extension of her teaching abilities within the dance. I don't know the situation in depth, but both of these sound possible. If you are not happy with her teaching, you can at the very least attend workshops and get new concepts if there is np teacher to move on to. Or, study videos and be honest in your assessment in what you can get off of them, keeping in mind that a video never gives you feedback, so it is harder to progress with them with any kind of surety.
Best wishes and regards,
A'isha

Talk to your teacher honestly and respectfully. Tell her you are not feeling challenged. Ask her how to get more out of class personally - after 4 years she is sure to have a handle on what you could improve. Ask to swap out some of the work you do for private lessons - or pay for them outright. Expand your world with DVDs and other workshops and bring it home and have her help you incorporate it into your current knowledge. Your new interests may inspire her as well!

Most importantly, talk to her! I had a student leave once, giving me one complaint about class size but I found out that really it was something entirely different. I felt that it was very unfair to be mislead into addressing a problem that wasn't really her issue.
It is a 50/50 relationship, as A'isha said. Give her the info she needs to work with you where you need to be - also be open to her evaluation of where you are.

A 4 year relationship is a terrible thing to let go sour - sit down and have a chat with her :-)

Mahin

I would request private lessons to work on your own goals or suggest a higher level class.
If you knew of possible 2 or more students who would be interested in working on more intense/challenging/goal-oriented style class I am sure she would be happy to comply (if she has the time)

... because just as students can bored with the basics- so do instructors!
I know I would be thrilled to have a small collection of students who wanted to work harder at getting into the more complex areas of taking their artistry to the next level.

Just make sure you can define what your goals are so it will be easier for her to supply the appropriate instruction (granted she is willing to do so).
Are you interested in a historical learning approach- understanding diverse ethnic influences in and of themselves and how they interweave into modern fusion dancing?
Or are you more interested in the physical challenges of doing more intricate layering and dynamic combinations? learning to choreograph your dances better or improving your improvisation skills?
Understanding how to work with props?
Creating stage presence or defining your own unique flavor?
Or are looking to use your dance practice to sculpt your physical figure & increase muscle strength & stamina?

The problem that instructors face often enough is how to balance their personal interests with the needs of their students. I think some of the best potential students are too polite in voicing their desires to instructors who would be happy to meet these needs if they were more aware of them. There are so many fascinating and interesting paths you could travel when it comes to learning bellydance- there are lot of routes to exploring what it has to offer.

Figure out what it is you *really* want and ask her if she can help you find what you're looking for.
That way if she has no time to meet your needs, she may know just who to send you to or offer another solution.