My dogs in heat?? She's really Quiet and sad?

My puppy's in her second heat (She's 11 months) and she's become all sad and not hyper at all, do dog's do this when there in heat?
We were going to get her desexed/spayed/neutered but we can't while she's in heat.
She's not really playful and just want's to sleep which normally she's the opposite!!
 
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