Signal is public and lift in building is private. There must be a reason for everything:
1) is she trying to extort money? Should be a reason for this.
2) is she trying to implicate all males? For this too there must be a reason.
3) is she having personal animosity against you?
4) Was she a known person and something didnβt work out?
There has to be a reason for all this, itβs just not clear now.
If OP has no link to her then better contact people who she was visiting that day? If she is resident then try to know more about her to get her motive for this act. Again, we only know one side of story for now.