if it eat, 便便 n 尿尿 like normal, it should be ok healthy.. 磨地下 seems to be 發情, becuz when my cat n my friend's cats 發情, they will 磨地下 also. Althought your cat have already 絶育, sometimes the doctor had done something wrong so after the cat had 絶育, it will just like haven't 絶育.