Is she taking any dairy solids? Sorry I don't remember if she is able to have cheese, yoghurt, custard etc.
If she is able to take dairy solids then tbh I wouldn't worry about her only having 12oz of milk per day. All dairy solids count towards milk intake at this age so although milk is perhaps a little lower than you might want you can add to it with cubes of cheese, fromage frais, milky sauces or puddings etc. It sounds to me like she is just not hungry enough to take more whether it's milk or solids and is just eating to her fill on either. You might look at her solids across the day/week and see if there are any 'empty' foods which fill her up without adding much in the way of nutrition, I did this with my DS because although he eats well every mouthful counts so for example in our case it might have been cutting down on fruit even though it is healthy, to increase protein or dairy etc. So for instance if she has 12oz of milk then a couple of oz of yoghurt, an oz or two of cheese in the day she'd be reaching the 16oz you are looking for.
Once she is 12 months 12oz of milk including milk used in food and dairy products is fine. Mine dropped a bit under 12 months and I also discovered that the more dairy solids I gave him the less milk he would take, he was self regulating his dairy intake to his need, sometimes they are rather clever!
i wasn't even thinking about P'ting when on earth do i start thinking about that?
Sorry, didn't mean to scare you
Really it is up to you. The BW way is to start at 9 months, 11 months would be great if you want to nip out and buy a potty now
There is a whole wide range of ages people start, the more recent trend in western countries is to wait until more like 2.5 or up to 3yo although many books/methods say 18 - 30 months. I started mine at 10 months, it is a gradual process if you start younger and for me that was absolutely what suited us. He had his first fully dry day at 16 months but I didn't stop using nappies altogether until he turned 2yo, I used to use a nappy when we went out but treated it like pants so he still asked and was offered the toilet when needed. And I continued to use a nappy at night time until today.
There's no pressure, you do it when you feel ready and when you feel LO is ready, the regular 'signs of readiness' don't apply to the younger toddler in a gradual approach to PTing like Tracy suggested. There are support threads for whichever age and stage you start.