Answer:
You should consider bringing this up to her if it continues to happen. If she is really your best friend, she would understand that you are more than just some help tool. Remember, it's totally ok to set your boundaries and make them known.
Step-by-step explanation:
Let her know that you're not just there to help her buddies with whatever, and that there are other available resources for them to use, if all they need is help. Also let her and her friends know, in whatever way you feel is best, that you are a person too, and they should consider your feelings as well, because you matter.
Hope this helps you :)