Was your dd a refluxer as a baby/young toddler?
My ped explained me that refluxer kids have a problem keeping an empty stomach for periods longer than 8 hours. That's exactly what happens with my ds. He'll starve at the 9 hour mark and if i don't give him a bottle (he's almost 2 now) at the 8.5-9.5 mark, he'll wake after 9:45 hours of sleep, cranky and not going back to sleep (which is what happened with your dd). What i do is sort of a "feed to sleep" (instead of wake to sleep) and i go to his room at the 9 hour mark, sip a bottle while he's asleep (which he drains complete, so I'm pretty sure he still needs it). He takes 3-5 mins to drain it in his sleep, so i pick the bottle and leave. It is the only way i can get him to sleep 11-11.5 hour intervals at night. Without the bottle he'll do the dreaded 9:45 and will not go back to sleep if he wakes from hunger. He's crabby and cranky until naptime then.
Is your dd taking the full bottle? I think it's ok to give that to ehr if you're positive she needs it and it is not a habit. If she's only taking a few sips/ounces then that's pretty indicative that she's waking from habit instead of hunger and it should be ok to water down the formula or offer plain water until she gets rid out of it. I guess this would be a problem if she asks for it before the 8 hour mark.
HTH and good luck!