Most likely she got her own tell like a spin or a look and you have yet to pick up on it.
It takes time and sometimes it not easy to do sometimes to read thier body language.
If the bell did not work try something else like one on the floor lilke the bell when you ring for service at a front desk.
JL
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"The truth about an animal is far more beautiful than all the myths woven about it." Konrad Loranz |