Hi, Jack....you're right to be watchful of this situation and to seek out views on it. Hope you will see a midwife tomorrow and she will be able to see what is happening.
If she has really not fed since 11 am this morning, you really have to give the maternity unit a call. It may be ok, but babies should not go this long without a feed. As a one off, though, plenty of babies do, and then things settle down. However, this (the 11 am feed) was the first one for 9 hours, so all the more reason to be watchful.
If she is not feeding normally, you must get some fluids into her: express by hand or pump and make sure she takes what you produce, by (egg)cup or bottle.
This is me being very directive, sorry, but I have heard from too many mothers whose breastfeeding (and babies) have hit a real crisis because early signs of things not going well were not acted upon.
I hope she is weeing plenty; she should also be starting to produce soft yellow poo.
It is not 'good' by the way to feed 3-4 hourly; it might be 'ok' for some, but it's actually less often than most babies need at least at first. It's also not necessarily reassuring that she's not 'sickly'; feeding can be heading for a crisis without the baby being sick at all.
Moondog's suggestion of keeping her in close contact with your body is sensible and may help. None of the helplines will be open now, so do call the maternity unit, unless you are now happy that all is well.
Keep us posted!