2yo taking clothes and diaper off every night/nap

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I’ve tried putting her sleep sack on backwards, putting two diapers on her, letting her choose her own pjs, and nothing works for long. We’re going to try potty training as well, but both of us don’t think that’s the issue. We have a 3 month old, so it could be an attention thing. The other problem is she’s peeing in her sleep (not all the time but often enough) and we don’t find out until the morning, so she’s literally sleeping naked in her pee. Her diaper is completely dry when she takes it off, so it’s not that she’s uncomfortable in a wet diaper.

Any ideas?