I personally don't think it's too young for resource guarding. It needs to be caught early and prevented or it might become aggressive behaviour.
Does Chewie know "stay" well (i.e. sit still at a distance)?
If so, I would try to get her to stay at a distance (on the floor first and then maybe on the other side of the couch). Then, while Chewie is in "stay" mode, you show affection to your daughter (hug her, put your arm around her etc) while saying 'good girl Chewie' and throwing treats at her - as long as she's not showing possessive behaviour. And repeat daily!
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