Not wanting to come to your home may be she is shy and/or uncomfortable with men OR because she was a woman alone and didn't feel she knew both of you well enough to be alone with you in your home.
From what you have added about P-Vine tells me you are being a "good" cautious and it is good to keep an eye on things. P-Vine and/or you need to be sure to set boundaries. Sometimes that can be done by simply not responding. Other times, it may take more as others have noted above.
If you do find she is coming out of a relationship, is lonely, needy, etc. and you get a chance, it would be good to have some suggestions for where she might get some help.