Sleep advice? Help!

Ok first time mom here! I got my daughter into a bad routine with sleep and I’m looking for advice. She is one who likes to be rocked to sleep... I know, bad momma but when I was working it was a really special time we had for just her and I or her and my husband (I’m going back to work in a week and my husband currently works full time). We also got into a bad routine when my husband was away on business and a trip with his friends. If little miss would wake in the middle of the night I would go right in because, let’s face it, her and I both needed sleep and my mom was staying over to help and didn’t need to be kept up by a crying baby. I’m now realizing a couple weeks later I accidentally continued the routine of going right in and nursing her to calm her and then rocking her. Now I’m trying to get back to how it was before. Some other details to note: my daughter is 8 months and likely shouldn’t need these night “feedings” (I was giving her about 15 minutes of nursing due to teething but she’s not teething right now as far as I know), she’s pretty advanced physically - when she wakes, she pulls herself to a stand in the crib and that keeps her awake while she cries, I started our 15 minute “let her cry” time again which generally doesn’t get her back to sleep because she’s standing or will knock her head in the crib from being tired and standing... we do have the mesh crib liners which don’t do much.

My question is how do I get back to a routine with sleep? Should I continue the 15 minute “let her cry” and go in after that time? Then should I try to keep her in the crib, lay her down and use nursing/rocking as a last resort. I feel like it’s even worse now that she’s older and I have to change up this routine.