Was I in the wrong?

My friend and I have 7 year old daughters. My daughter is much much smaller than her daughter. Well we decided to have a play date and let the girls go swimming in my daughters pool. I told my friends daughter that maybe she could come over yesterday (this was on Thursday) well I told my friend that I would text her and let her know whats going on. Well I forgot my daughter had a dr appt Friday and then she messaged me this. Now her daughter and my daughter go to the same school, my daughter comes home after school crying because this little girl is very mean to her. Making fun of her and all sorts of stuff. Now I wasn't home when they came over as I said I took my daughter to her doctor appointment and my husband was home. He works 3rd shift so he was probably sleeping if they came over. Was I wrong?

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