so my daughter will be 7 months on the 28th and idk how to play with her. my son was so awesome at…

so my daughter will be 7 months on the 28th and idk how to play with her. my son was so awesome at playing and everthing and I know every child is different but she isn't sitting up on her own or anything besides rolling over yet. and everytime I try to play with her toys with her, she just gets frustrated because she wants to play and just can figure out how to. idk what to do :( I wish I had an excersaucer. my son loved to play in his. why did I get rid of it? 😧 lol