sorry to be the bearer of potential bad news but please make sure you keep her bloodwork consistently checked...
eating onions is one of the (many) things that can trigger a nasty blood disease called AIHA/IMHA - auto immune hemolytic anemia.
reason i know this is because my dog has it and has been battling it for almost 6 months now.
i dont know specifically what triggered our case, but i know (through research) that giving onions or garlic are one of the initial triggers.
i wish you guys the best