If she's current on her rabies vaccine and she JUST started her heat cycle, I imagine it's a case of hormones and two females in the house. Females get testy no matter the species. Cramps, body aches, headaches, etc. I know Shasta got pretty testy when she went into heat and she's the sweetest most mellow dog I've ever known.
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Shasta GSD 5/5/10 CGC, NTD
"Dax" Thor z vom Weberhaus CAA, RATI, RATN, ITD 3/18/2013
Zena GSD 6/1/03
Riley GSD/BC 1/10/05-2/1/2013