I swear it could have been me writing your post. My 3 month old does the same thing. She hates pt/shush. She hates being on her side, and the shushing seems to make her much more upset. I don't have a reliable solution yet, but this has worked for me in calming my DD down. I do the windown routine, and i've made it a bit longer because my daughter is a bit touchy. Sometimes pt/shush for touchy babies is too stimulating, which is what I think is happening. Anyway, I swaddle her downstairs, talking to her and letting her know it's naptime, and pick her up to go upstairs. She starts squirming in the swaddle and before I would try to calm and hold her down. We would sit in the rocking chair in her room, but she would start fussing and getting worked up and arching. Now, instead of fighting with her, I tell her in a calm voice, I'm not going to fight with you and I get up and lay her in the crib. I take my hands off of her and see if she is getting more or less worked up. If she is more worked up, I pick her up, pat her on the back for a couple minutes but if she fights me, I put her right back down and repeat to her that I won't fight with her. I try my best to calm and soothe her in the crib by patting her tummy, leaning over and whispering in her ear. The past couple of times I haven't had to pick her up more then once, she will calm and eventually go to sleep in 10-15 minutes in the crib. I think the key for her is that she now knows that if she fights me, she goes into the crib. She has even let me hold her in the rocker without fighting me for a little bit and then I can put her in the crib drowsy. I don't know if this will help you, but I wouldn't do pt/shush for your dd if it's making things worse.
