It depends on her personality. If you think she will not "玩野", let her have time to find job or help her to find another employer. But why can't she respect your mother? Some maids are good at pretending before their employers. Be careful!
I will let her go as soon as possible. If you tell her, you will fire her, you don't know what she is thinking and her reaction. In the first place, she should respect all the family members....
My maid threaten me she must take leave back for 2 weeks or resign if I not approved. How can I find another replacement in just 1.5 months ? I think she is playing me !