
She really should not have come to you for at least another week, but what's done is done.
Also you are making a rod for your own back by making too big a difference between the attention she gets in the day when she sleeps and at night. Do not let her sleep in your lap, as she will over attach to you (not surprising having lost her family), and then find it harder to cope alone at night.
You need to pop her in her bed or crate when she needs to sleep in the day, so that she learns to cope without your constant presence.
It is not unusaual for a puppy not to eat well for a day or two. Keep putting food down four times a day for 15 minutes and then remove it.
Assuming her size may be half way between that of her parent breeds I would expect her to be eating about 200g a day of dry food, or the equivalent in wet food (about a baked bean tin size or pack of nature diet), so she needs about a 1/4 pack of nature diet per meal, but more if she will eat it and not getting fat.