You do need to talk to this person yourself, to get the answers you are seeking as to why she is mad at you your intuition is telling you already there is a problem here.
Your feelings which is your intuition your (gut feelings) tell us, warn us, show us, and teach us why we need to trust our feelings.
We all are born with intuition to help us, guide us, warn us, and allow us to feel the truth of our soul the truth we cannot suppress or deny that will keep coming up telling us that we are feeling something isn't right or something is right...
There seems to be mixed feelings or confusion with you with this person she is either a good friend to you that you can trust and put your trust in or she isn't you say we used to be good friends? but she is mad at you,? but she's really great???
You are the only one who can know whether or not this person is sincere with you or not spending time at work with this person should be showing you, telling you, and allowing you to feel what is false and what is real with this person..
It is your choice to act on your feelings or ignore them I would have a good honest open talk with this person then you will know where you are and if you should stick with her or not.
A persons actions and what they say to you should allow you to see the truth of a persons sincerity...
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