I need to be really honest - 2 night feeds in an 4.5mo ebf baby in completely normal.
It took until 4am for her to fall back asleep
She woke then at 5am - I fed her then, didn't need to as she only took one side so it was also for comfort! she woke again at 6am and I fed her the other side!
I wouldn't assume that 5am feed was for comfort - if she was awake from 230-4, then she could very well have been exhausted. She fed enough to take the edge off, and was so tired that she fell asleep after only 1 side. But she was clearly still hungry, as she woke again within the hour to take the other side.
Again being very honest, I would have fed at 230am if I was in your position. My own rule of thumb (growth spurts aside) was that I wouldn't feed more frequently at night than during the day - so when Dylan was on a 4h EASY I wouldn't feed any more frequently than 4h at night either. That meant that if dream feed was at 1030pm, and he woke at 1am, I would settle another way. But if he woke at 245am I would feed. So even though your dd had a huge feed at 930pm, she woke at 230am (5h) and I would have fed. Breastmilk leaves their stomachs empty very quickly because it's so easily digested - whether it was 4, 5, or 6 hours her stomach was definitely empty.
Along those lines, I wouldn't take the hard line of no feeds until 6am at this young age. Not in an ebf baby. Just MHO
(((hugs))) It is so hard when you just want a good night's sleep!