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So it was my (Male-32) birthday a couple days ago. My sister (Female-25) from her fake fb account sends me a super basic "happy birthday" message I see it but don't recognize the name so I think OK thanks whatever. Me and my mom go out shopping for a while and I come back to see a message saying "too good to respond?" Confused i go to look and recognize the picture so I immediately respond "sorry forgot your fake fb account. Thanks" she comes back with "why are you such a dick? Must be great being the favorite living rent free." More confused i respond with "What? OK. Sorry. Thanks" haven't heard from her since. What do I do?

For clarification yes I live rent free but I do pay for the groceries and cook for the house