Hi there and big hugs! Congrats on your new baby! The first few weeks are so whacky aren't they?
I think perhaps she is a touch overtired. She can probably only tolerate 60m max from the time she wakes up until she should be in the crib being pat/shh'd again. I know it seems like an impossible task to feed and change and do a wind down all in that small amount of time. But your wind down doesn't have to be too involved at this age IMO.
Perhaps wake her at 7am, change her and feed her. You may need to stimulate her while she is feeding, sometimes undressing them a bit and draping a light blanket over you both helps, or rub her feet, talk to her - anything that you can do to keep her awake and eating. If she starts to drift off, perhaps stop and burp her. I remember sometimes it was so hard to keep Owen awake! Around 745ish begin winding down - are you using the 4S's Tracy describes? You can begin to pat/shh her swaddled and up on your shoulder, when she seems clam put her down into the crib - don't put her to sleep on your shoulder. Give her a moment to see if you even need to pat/shh - if so... turn her on her side (we used a small blanket rolled up in front of O's tummy to hold him there) and pat/shh - go 7-10m past when you think she is sleeping then slow your patting and shhing. I think this is important because I find it was startling to just stop suddenly. Slower and slower then stop and leave your hand on her - watch her, if she still seems settled and sleeping let go and step back, watch her again, leave if she seems to be sleeping. She may sleep about 1.5-2h. If she wakes before that, you can try to go back in, reswaddle if needed and pat/shh again - repeating above. Always wake for her due feeding, always stop and feed her at her due feeding time. Always pick her up if she begins to cry hard, calm her up on your shoulder and then put her back in the crib and pat/shh there.
If she sleeps a short nap you will have to try to get her down sooner for the next one - which is hard when they feed for 40m I know! You just do the best you can - the routine will never be perfect so don't strive for what looks perfect on paper, you will make yourself insane!
I really think she is just overtired, try starting for the nap a bit earlier, and try your best to keep her awake and on task at her feeding. I hope this helps some! You're doing a great job, we just do the best we can trying to keep baby from getting overtired and go from there! Hang in there!
Zoey