Should I continue letting my friend copy my math homework?

I already suspect the only reason she hangs out with me and my other 2 friends is because I've been letting her copy my math homework since this school year began. I get A's in math meanwhile she struggles with low B's and C's. Math isn't for everyone. Understandable.

Though it's getting kind of tiring always having to hand her my homework. I took my time and energy on those exercises (not my fault I had natural skills for numbers) and she just copies from me every single time we got algebra II.

Or for the sake of keeping her friendship, should I continue letting her copy? I don't have too many friends anyways.

Updates
5 mo
I already have a hunch she won't hang out with me anymore if I don't let her copy my homework.
Should I continue letting my friend copy my math homework?
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