Please help!

I need ideas on getting my 6 month old baby girl to sleep in her crib. Not only do I have to nurse her to sleep but then I have to tip toe her to her room and get her in the swing and buckle her up in order for her to stay asleep. As soon as she hits the crib she freaks out. She hates being swaddled and the only thing that puts her to sleep is my boob. It's exhausting and I have two boys who are 6 and 4 who are dying for more cuddle time with mommy. As of right now she is crying in her crib and I will try the Ferber method as much as possible but I cave everytime ughhhh any ideas are good ideas ladies pleaseeee