Child messing up sheets and blanket

This is actually really common! Some kids will find a way to get you back involved in their sleep process even after doing so well for a while. So then, you've got to figure out how to get back out of it again!

Question: "We were doing so good and something took a turn for the worse. I cover her up for bed and my daughter literally gets out about 5 times for me to cover her up again.. even tho she was covered up! I try to say no and tell her she can do it but she messes the covers all up where she can’t fix them or gets upset bc they are alll over the place. Help! She also will wake up at least once during the night to have me cover her."

Answer: You don't want her sleeping without a blanket so you feel the need to help her fix the sheets. But you really don't need to do that! This is just a new trick she has learned really gets your attention.
So, tell her, from now on she gets only 1 tuck in at bedtime and that's it. Then practice pulling up the covers during the day. You can try to make it fun. You mess up the sheets and time how fast she can fix them by herself. Do it in the dark if you need to. Then you can lay in the bed and have her mess up the covers. See who can do it faster. This shows you that she can fix her own covers and doesn't really need your help. So you can feel more confident not going back in - which is ultimately what you're going to need to do. You have to remove the attention that the blanket is getting. Then let her do it on her own. My prediction is she will quickly learn not to mess her covers up if you're not coming in to fix them.
Other options are using a simpler blanket - just one blanket and not sheet+blanket, getting a thin sleeping bag or mermaid tail blanket which is tougher to mess up, getting elastic blanket holders that help hold covers in place. But those elastic holders are meant for normal rolling around, not kids who are really pulling and trying to mess them up with is what it sounds like she is doing.