Have you tried "wearing" one of the lovies so that it will have your scent? A blanket would probably be easiest. Whatever you choose, you could sleep with it next to your skin.
Neither of my grandchildren were attached to anything while they were babies. They just eventually learned how to soothe themselves to sleep. My daughter used the cry it out method. I think that there are other more loving ways to do it. The tricky part is finding one that works and having patience until it does work.
There are some good books about sleep issues. I'm sure some of the other mother's can give you their titles.
I don't know if this is OK but my daughter sometimes gave them a bottle of water in their crib. They held it themselves. Once they could use a sippy cup they took that to bed with them. They used the sippy cup, taking a drink without waking up, for a couple of years.
Perhaps the sippy cup was their lovie.
My granddaughter is 8 and acquired a couple of lovies while she was in preschool. One is a blanket from her other grandma. The other is a beat up looking teddy bear that I gave her.
My grandson has had several stuffed animal lovies since he was 2 or so. He's 5 now. He has lost several. He lost his latest and I was able to find a duplicate on Amazon. His smile was so big when I gave him the new one. I'm going to order a second one to have on hand.
These lovies had an attachment first to someone they loved. Perhaps you could play with her with the ones in her crib. Start with the one you think would be most comforting.