Advice please

So my mom is in a difficult place in her life, some things were out of control, but most she caused herself. She has borderline personality disorder and is very bad at interpersonal relationships. She will totally rip you apart one day, then expect you to love and take care of her the next. She has been emotionally and verbally abusive and manipulative for 10 years at least. Last time she came and stayed at our house (against my husbands wishes) she caused drama like we expected her to. She just texted me (knowing we are out of town), asking if she can come stay with us tomorrow night. I know my husband is against her staying at our house (she only lives an hour away) but I don't want to tell her that and cause further strive between everyone. How do I repsect my husbands wishes, protect my family, and let her down easy?