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The reason for her acting out may be many. You are right to suspect that one of the reason may be for what words were exchanged prior to that (rather than ignoring her during a presentation by another speaker)
However, her behavior does not seem professional and it may be considered hostile working environment. It would be suggested that you speak about this to someone in your HR department especially when this scene was witnessed by others.
If she had had something to say to you it should have taken place privately and in a composed manner.
Don't try to personalize this situation. People (even supervisors are human and prone to errors) Nevertheless, she had not acted professionally and you could seek some resolution now with the personnel staff.
Poor impulse control, trying to exercise one's authority, or trying to prove a point to you (although very unprofessional way on her part) possible displaying her frustration about something else she's dealing with and you were the easy target. Anything may be a cause as people are complex beings.
Perhaps try to talk to her when she appears calmer and more approachable. Ask to meet privately.
All the workers are afraid of her even my boss but with me she refuses to meet me one on one and she never yells at me to my face as she does with everyone else in the district. I don't like her . I know you do not have to like a person to work with them but at least you should be able to offer some respect for them. The sad part was I actually liked her maybe because I thought she was someone else.
My question to you is why won't she yell at me instead of talking about things to me in a meeting and through it off on counselors and not me who is a career specialist?