You're might be doing her a favor but the situation certainly isn't doing you any favors.
You're a business, act like one.
I see 2 outcomes:
1. She loves you for making things work and never spends any money.
2. You tell her she needs to spend money and she finds someone else who's hungrier than you.
In both scenarios you win. You either have more money if she goes with option 1, or you have more time if she chooses option 2.

You can't yell me that you made enough money off of her other projects if she has an AVR from 2002.
That was 15 years ago!