I use Rescue Sleep for myself and have given it to my 3 year old but haven't tried it with a young baby. What about trying Chamomilla? It's for teething and colic. I've used it for both my boys and believe it's safe (my parents gave it to us as children too!). The container says for children under 12 yrs give two pilules under the tongue, but for my 6 month old (who has silent reflux and is teething!) I put one pilule under his tongue and then give him his dummy to suck. You can get it from health food shops.

Hope she becomes settled soon.