You fire her and make all the arrangements, then she "sick", you already keep her at home until she fully recovered, you know 水豆 could spread to others ga!! You wait until she recover, you are already a good employer la! If I were you, I won't let her stay with us at home, I will send her to boarding house, until she recover, then fire her.
If her attitude and good performance, she won't be fired la, right? It is not your fault.