Yes, but just silly things Stealth. Like I'll say I'm going to IKEA or John Lewis and she'll say, "Oh, can you get me x while you're there?". And I do but she is soooo reluctant to give me the money back. When the situation is reversed, however, she texts me (from the shop!) and says, "I got your x, can you Paypal me the money now?".
I know that, financially, we are in different worlds. Both her and her husband work full time and, at an educated guess based on what she's told me, I doubt they bring home half of what my husband does and have a much bigger mortgage than us. But just because I can afford to buy her things and never get the money back, doesn't mean I should.
With other friends, I tend not to give them money for things I've picked up for them at the shops (unless it's a major purchase) and they don't give me money either. We figure it all evens out in the end, more or less.