If she's having that much food I would say she probably doesnt need the 10pm bottle any more.....just not doing it one night. I bet you any money she just sleeps through. DS did when we dropped his 10pm feed at 6mo (we started weaning at 5mo and he was on 3 meals per day by 6mo).
That would mean you LO is not having 20oz of milk per day, but remember that's just a recommendation. A guideline. Not all babies will want/need that much milk, and contrary to what you will read on here, those guidelines are not laws and you are not a bad parent if your baby prefers food to milk!!! If you're worried about baby not getting the vitamins that are in the formula, give her baby vitamin drops. And make sure she has plenty of dairy in her food (i see she's having porridge with milk, and yoghurt as well) - as she gets older you can give cheese sandwiches etc as well.
No one really talks about it but theres's a kind of hysteria on MN about bottle fed babies have 20oz of formula a day until 1 year old as if it;s some kind of LAW where you baby will get ill or something if they don't. i don't know where this comes from (actually, I have a fair idea but can't be arsed to go into it now as will get a proper flaming), but by 7mo my DS was having 6oz milk in the morning, 4oz mid afternoon and 5oz at bedtime. He quickly dropped the afternoon bottle and at 8mo was having just morning and bedtime bottles (6oz).
One day, around 10mo, he woke up and just decided he didn't want/like milk anymore. I tried giving it in cups instead of bottles, warmer, colder, etc etc etc. he just smacked the bottle/cup away. Continued to love his food and eat like a horse. Still does at 15mo. He is 75th centile for weight and 91st for height, a big healthy boisterous boy and always has been. He hasn't dropped any centiles since 2 weeks old and is thriving. He walked at 12mo and all his milestones are bang on. I give him vitamin drops once a day and cook with loads of dairy for him since he dropped all the bottles. he is fine.
Sorry for the rant! Just feel sorry for other mums in my position who thought there was something 'wrong' with their babies, or that they were somehow 'getting it wrong' if their LO prefers food to milk. Some babies are just like this I reckon.
And look: the guidelines also say that babies should be BF'd, not FF. Well, that might be the ideal and what it says in the guideline but it didnt work out for us. And neither did the 20oz of formula recommendation. And we're both fine.