I'd be waking her too, hun
Prob don't let her go past the 4hr mark - so where you said she fed last at 1.30pm I would maybe wake her around the 5pm at the latest? Then feed again around 8-9pm and see how she goes overnight from there.

Of course, I'm not a LC, just going on what I've done with both bubs and what has been recommended to me
Hopefully Barb will see your post soon xoxo