It is perfectly normal at 5 months to need a NF or 2 even with a DF. The DF is not intended to necessarily allow a baby to STTN with no NF, it is intended to skip the 1/2am feed and move onto the 3/4am one. It does sound like she is hungry if she wakes at 3am and is complaining every 10-20mins, that is definitely a hunger sign if she doesn't settle, so please go ahead and feed her
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My guess is she'll feed nicely and be straight back to sleep in no time, which means more sleep for baby and mommy.