A year ago I made a new friend on the school run. She became a very good friend and our dc started playing at each other's houses etc. We also talked a lot about our various difficulties and have supported each other through them. For the last 4 months though she has asked to borrow money once or twice each month. I didn't mind at all to start with and she has paid me back each time. However the amount is going up gradually and I'm starting to feel like it's introduced an odd feeling into the friendship. I know what she needs the money for and I know her situation and I wouldn't want to say no.
As I said she has paid me back each time so I'm unsure why I'm feeling this way. Any advice?