At 3mo it's very normal for an ebf baby to need one or even two feeds in addition to the dreamfeed. If she is going from df to 5am that's an excellent stretch at her age! I would continue to feed if she wakes.
Re: the dreamfeed, it just doesnt have an impact with some babies, where some babies it makes a huge difference, and many fall somewhere in between. Tbh though, it sounds like your nights are going very well so I wouldn't change anything!