Just buy one of those baby swings for her (there are some super cheap ones on kijiji, in my area at least, going for $20) It worked when I had my 9month old over time they will become comfortable and now she has no issues snoring away in the playpen
Would she be too big? My son outgrew his quickly (he was a big baby!) so I'm not sure how long most average-sized children use them? She is almost 10 months and on the smaller side for her age, I'd say.
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