Baby won’t sleep

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I need some serious help, my almost 7 month old has been really not sleeping for the past two months. She used to sleep all night from 9-9/10 but she got a cold from her older sister and that’s when this started, I thought she would start sleeping well again after she got over the cold, but here we are 2 months later and she barely sleeps for 5 hours on good night 😩 most nights she refuses to go to sleep before 9:30 and then she wakes at midnight for a bottle and then after that she wakes up every hour or so and then at 4/5 she wants to wake up and play until almost 7. She only takes one hour naps and she fights sleep all the time now no matter when I try and start putting her down, I just need some type of advice as I’m losing my mind with her and a 2 year old 😅 TIA!