Is your hubby with u? Ask him to deal with her and try to stay away from her. No need to hide your feeling. Just let her know you don't want to see her. Don't show you are afraid of her.
Stay calm. You didn't do anything wrong. Be strong and you have to protect ur bb.
Call your friends or C6 accompany with you as soon as possible. Do not stay alone with your 99. Better pretend sick and go hospital if cannot get rid off from your 99
If push comes to shove and u have to meet ur 99 face to face just tell her you are back from GC for the day for OB check up and will return then immediately afterwards and you have a flight/train to catch.