My Goddaughter start hitting and screaming 😞

I love my goddaughter (my bestie daughter) she’s 26 months old about 6 months older than my son. I love how she and my son play together but oh man she has this temper that she wants to take all the toys away from my son and she would cry and hit my son in the face and yell so loud “mine toy or my turn!!!” And sometimes she would push him from chair, while walking, riding a toy car...and whenever she see my son holding a toy she would take it away from him. Of course my son always get upset and get frustrated but he never hit her back, there’s a moment he doesn’t wanna play with her. It gets very stressful when u see both toddlers crying! My bestie would try to talk to her but I don’t think she ever listen (with that age is hard) she will say sorry but after few minutes she will do it again 😔. I actually never met a toddler that has a temper like her and I’m afraid that my son might influence her temper.