Has she got normal joints??its a hard one i know you must be torn but its gonna be a lot for a little kitty to go through,probably painful aswelli would hate to be in your position.I agree about the vets,especially if they are young and newly appointed they do like to be dramatic!a second opinion with a senior partner may be worthwhile.I know cats can live perfectly happy with one limb removed,but two just wouldnt be possible.