Some parents🙄

I went to the park today with my daughters (I have a one year old and a month old baby). My hubby was swinging my older daughter while I was by the stroller with my baby. Suddenly there was this 10 year old girl. You can tell right away she had something wrong with her. She asked to see the baby in the stroller. She started touching her all over her face I said “ooh we got to let her sleep so she doesn’t cry” in a nice tone. Then she started shaking the stroller hard. I asked her not to do the please. I went to look for her parents while I was doing that she kissed my one month old baby on the forehead. She left all her spit on there too. I asked her where her mom was and she pointed across the field to her mom siting with her younger sister. I just got so mad that her mom didn’t say anything when she saw her shaking the stroller. She grabbed everything on my stroller too like my keys, the straw on my coffee cup, the blanket. She kept trying to cover the whole baby. I just felt like a bad mom for letting her kiss her on the forehead because you never know if someone is sick and my baby is only a month. Thank god it’s not flu season. I just wish her mom would’ve said something not left her. Do I have a right to be mad? I don’t know why I feel like a bad mom for letting her kiss her and risking her of getting sick. I just didn’t know what to say to the girl because I didn’t what was wrong with her.