Bed time for 3 month old

My daughter is 3 months old and typically goes down for bed at around 7:00. We start our bedtime routine at 6:30 (bath, PJs, etc) and is visibly tired by 7:00 (rubbing eyes, yawning). She’ll sleep for about 45 minutes then wakes up and has an extremely difficult time going back to sleep without being held. During the day and every time she wakes up for feedings during the night she has no problem going back down to sleep. Sometimes she’ll fight me for up to two hours after waking up and I end up in an out of her room until 9:00 sometimes. Any suggestions?