Truly there is nothing you can do about your daughter's time with her dad. You can not control it all you can do is let her come home and look at some books or take a nice bath to calm her down. One thing I am trying to learn or grasp is that the only time you can be in control is when she is with you and that all children want time with both parents, let her enjoy her time with her dad no matter how it makes you feel, and if he is an on again off again dad you have to let her eventually work that out, just be there for her and let her lead the way when she gets home, if she wants to share what they did together with you listen and if she just want to keep it to herself let her. My son only sees his biological father maybe once a year, but he still longs to see him and have a relationship with him. I don't agree with many things they do together, but I know I have taught my son well, he knows what ratings for games and movies he is allowed to watch/play and has let his dad know. As long as he isn't endangering your child the only thing you can do is love your daughter and be there for her through all these tough times. Don't forget to help her sort through her feelings as well. At four a lot of children don't know what to call how they are feeling or how to deal with it so walking her through them and giving names to her feelings is always a good idea too. IE "I am glad you had fun with dad, and I know you are excited you got to see him, but mommy needs you to settle down now and get ready for bed." That kind of thing, maybe let her draw some pictures of what they did together to give her dad the next week or some other activity she enjoys that may keep her from bouncing off the walls. Good luck it is a tough situation, but just keep being the best mom you can. Stick with your goals, discipline, and schedule as much as you can and worry less about what they are doing together, the time he has with her is minimal compared to yours.