I have to agree, my first thoughts were-sounds like she's used to monogamy and that she wasn't prepared for what it's like when the person who she's used to paying her sole attention is sharing that attention.
It can be difficult.
As this was the first meeting-my thought is that it's an excellent intro into discussion of mind readering as galagirl says-and then deeper discussion about expectations and desires.
Like-what do you expect to be able to do when other lovers are there and what does she expect (she seemed pretty confident of what she expected-but it might be good to discuss how that works if it was her who had two lovers in attendance) and go from there..
"Love As Thou Wilt"