M.W.
If you've found something that helps her, give it to her, I say! You're not scarring or hurting her; you're helping her get through the pain. She'll give it up later, when she's ready. It won't make it more difficult to give it up later, especially if you wait until she's old enough to understand, rather than just having something she loves taken away one day. My daughter gave hers up at 3 1/2 with no tears, no fights, no trouble.