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Thinking about it some more there could be other issues. Females will get weird if there are other dogs around. They want to be the only dog for their master and will sometimes get jealous or act out to get more attention. Did you get the other two dogs after her?
Dogs that are losing their sight will act that way.Also, dogs that are having "mini seizures" will act that way.Definitely a vet appt is in order. I'd also have her eyes checked by a veterinary opthamologist.WRL