Did your MIL give your baby the baby's lip or MIL's lip? I can't figure out.
But you need to get on the same page with your DH. This is YOUR baby. Not HERS. You get to decide. Do you cosleep? If not, you can tell DH that that has also been shown to reduce SIDS. Does he want to cosleep too? Then your baby can just nurse all night and you don't have to worry about a pacifier.
We tried everything in the world to get our first daughter to take a pacifier so she would have it at daycare. She WOULD NOT do it. We bought every kind on the market. She only wanted to nurse. Some babies will never take them. It doesn't have anything to do with you. I'm sorry you're going through this.
Lilah 10/08 nursed 25 months
Beatrix 01/11 nursed 30 months