Help weaning 19 month old

So I need some help. My daughter co sleeps with my husband and I. She’s 19 months old and nurses 2x a day, when she goes down for her mid day nap and when we go to bed. She literally nurses for a couple minutes and falls asleep then I take her off. I’m 18 weeks pregnant and I’m trying to fully wean her. I feel awful about it though. I don’t want to stop but I’m worried it will be too much to tandem bf when baby gets here. I also have sometimes been wanting to wean her because it’s uncomfortable (not all the time). Today I just laid in bed with her for her nap and she lost her mind because I wouldn’t give her milky. So I got a bottle (she never used bottles) and gave her some almond milk. She drank some but wasn’t falling asleep. She then started crying yelling mama. I was literally in tears. She was screaming and crying until she fell asleep. My plan is to stop the naptime feedings and only do bedtime feedings once naptime seems better without nursing. Does anyone have advice on was to make it a peaceful transition? I close the curtains. Make it quiet in the room. We nap around the same time every day. I want to try to get her napping with out milky so when her sister comes maybe I can lay with her until she falls asleep and then sneak out of the room (which is what I normally do unless I nap with her). I just need some tips on what worked for you. I’m hoping after a couple days maybe she won’t cry like this and it will be the new norm to lay in bed until she/we fall asleep. Thanks for any advice! I also do not want to completely wean her. I want to continue the night feedings. Just to put that out there.