How concerned should we be??

Rae

My son is 8 months and my 8 yr old step has been very jealous since his birth. She is with us on weekends only. So far she has been caught pinching his nose shut when he was around 4mos., yelling in his ear, “playing” with him rough, shoving dry cereal in his mouth. The other day in the car I saw her take out his pacifier and lick it! She is very sick(has a fever and bad cough) I told my husband I’m done with her.. am I wrong??