I stopped helping people with money and now they call me wicked

Last month I told my cousin I can't lend her money again. She has collected from me 4 times this year and every single time it's one story or the other. The last one she said her landlord will throw out her things. I sent 50k. Two weeks later I saw her nails done and new wig.

When I called her she said it's her boyfriend who paid for it. I just laughed. Since I told her no, she's been telling family I've changed, that Lekki has entered my head. My own mother called me to ask why I'm behaving like I don't know my family.

I'm tired of being the 'generous one' who gets used. The same people who called me sweet now call me wicked. I'm learning that boundaries cost you relationships but they save your peace. Who else has been through this?