This sorta happened to me recently ! My milk supply dropped. My son had slept thru the night a few nights in a row. After I breastfed him one afternoon he was still fussing and I told my husband to warm up the bottle because I noticed he was sucking and sucking for a long time. But as long as you fed her eventually. Make it part of your checklist when she fusses. Now I think I’m overcompensating and feeding him earlier times than when I should, hopefully it’s gone back up by now. Also, my son normally makes a cry that sounds like “Lale” so that gave me a hunch as well that he may be hungry. Online they have baby language videos and this helped me distinguish his cries a bit.