I can't believe you have to ask if you are in the right! This is obviously not a situation where she is thinking clearly, and given space and time, she'll probably just get over this.
She's not a part of the decision-making process for this couch anymore. If you put it in the house, you may get bugs from it anyway, it sounds, because she clearly has had trouble maintaining her house lately.
This doesn't make her a bad person, but it sounds like she's overwhelmed and you're getting displaced aggression from her. Give the situation a rest and let her recover. Don't mention it again, and toss the foam chew-toy. Don't even mention what happened to it unless she asks. Go on about your business, and she'll come around.