Has she hit her 4 month growth spurt yet? If she's eating and going right back to sleep, and her appetite during the day is fine, I'd be tempted to see if things settle down again in the next few days. If this is GS-related, have you tried cluster feeding her in the evening--in addition to still offering her the DF? I know a lot of moms who have success with reverting to cluster feeds during GS.
When she has gas, does she seem to be in pain from it?
Lastly, if it's neither of those things, it could be routine related and she's OT; or the DF is disrupting her sleep pattern. Sorry, that's a lot of things...just throwing everything out there
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