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I also have very moody preeteen and am noticing when she is worse that it also is when she has belly ache (no period yet but defo the horemones and signs)
maybe a hot water bottle for her tummy and give her some space, I point out to my DD when she is being moody that its not nice to talk to me/be nasty to me and I wont engage with her while she is being like this. I do say that I think its her horemones but that doesnt give her the right to be like this. I often find leaving her alone and letting her go on facebook etc seems to settle her down for about 5 minutes somewhat.