What a spoiled, lazy woman! Kittens are a lot of work - Older cats sleep! Seriously, the only way I could think of a cat being "too much work" is by maintaining the litter. Thats's a whole three minutes out of your day to scoop Whew! Its always wiped me out. (note the sarcasm.) Unless the cats have health issues, but I'm sure you are well aware of the state of their health.

Do you know of anyone esle that could foster the cats until summer? I'm afraid that if she thinks they're too much work that she'll not want to wait until then. Grrr... some people need to have their heads examined.