if you dont feel comfortable, dont't give her. And since she already with you for 1.5 yrs, is about time you start to look for another maid. My last maid also told me she not marry, but those sms she sent to her "FATHER" i told my colleague to translate, is all about love love love. Maid cannot be trusted fully, like all other employees. There are things that we must give and take. But if you do find her behaviour unbearable, why not let her go before something happen.
She told you she need a off day becos her husband cheating on her. Frankly speaking, if husband really cheating on her, one off day where got enough, if is real, she would be asking to go back to hometown to check on him .