You are donating for the time, and time alone, as any other definition would make it tricky, now wouldn't it?
However, we all have "certain expectations" as to what will, hopefully, occur. Now, it kind of sounds to me that your lady friend is accepting what is given as she does not wish to define herself as an escort or as receiving money for "activities", but just getting "help". And if you have explained to her as to what she should do to improve her income stream then it is up to her to take the actions to make the changes. But it does sound, as you explained it, that the guy may be taking advantage.