Paula was in Byrne's run. First, she's the original host for Dark Angel during Time-Travelling Wonder!Polly's fight alongside the JSA. Then when Donna gets her soul nuked by Neron, they take her back to Themyscira in the present-day, and the doctor they give her to is a reformed Paula, hanging out on the island. Diana's not sure if she's trustworthy but supposes there's no choice.
Presumably we're meant to infer that Polly converted her to the cause of righteousness (as Golden Age Diana did, since Polly became Golden Age Diana), but brought her back to the island in the present instead of during WWII. However, even Jimenez never referenced or acknowledged this in any way, and when Jimenez doesn't reference your story point, you can be pretty sure that no one will.