I’d rather be homeless than give up my dog but there are reasons why people would, Martha could have bitten someone, a friends child, who knows, unless you are Tanya herself or part of her inner circle you don’t know enough to know there wouldn’t have been a valid reason... and ‘I don’t want it anymore’ is a valid enough reason. Might make you an hole yes absolutely, but if she didn’t want her, she didn’t want her. If she rehomed her, that’s the responsible thing to do. Telling someone to step-up just isn’t constructive if they no longer want it.
Demonising re-homing, if through proper channels, is not good for animal welfare.