I love collars too. Since Clyde's a boy, I can't get all girly but I love getting them for Lucy-- she's got at least 15 of them! I just got this one for Lucy, Integra, it would be so cute for Momo too! It was $30 on sale for $12.99 and the large is adjustable enough that you could probably put it on her within a month and leave it on. (Clyde's been wearing a full size collar since he was 4 months old and I've been adjusting it up)
http://www.urbanoutfitters.com/shopping ... uctID=7334I hope it's ok to put the link in. Sorry, I'm a shopoholic and I'm always trying to get other people in on my good deals!