Mum interrupts

I’m spending a week on holiday with my mum. She’s an amazing and inspiring woman but (my thought) she keeps interrupting in any conversation. For instance, if I’m talking to my nephew about his pyjamas, she might want to know what we’re talking about while she’s unpacking her suitcase? I’ve decided to think that “that’s the way she loves us” because I truly believe she means well. She wants to help as much as possible.
How about telling her that I need to focus and when I’m talking to someone, I really need to constrain and won’t heed her interruptions? Would that be a boundary?