I remember at that age (and I was pregnant with twins) it was very important to earmark a special time when I could rest, so I made my 14 month old's nap central to that. I always put him to bed for two hours after lunch. It made such a difference. The other thing that helped was arranging for people to come around on visits, or visiting them, just generally getting out and about to people's houses, as he loved new but familiar places ifysim. At home all the time he got very bored. Even just going to the park for the change of scene, was v important. I think they are just realising they are separate beings from their mums, but rely still on you for so much, which makes life frustrating for them I should imagine.
My son loved books at that age, being out and about, routines, water play, music, singing. He wasn't at all good at entertaining himself, or placid, and got very cross when I put him down to sleep, but he needed his sleep (and then he slept well) I remembering him punching me in the nose once when I carried him up the stairs heavily pregnant, it is certainly not an unusual phenomonen when children can't express themselves in words to use physical means, or tantrums and screams.
Also they eat far less, and far more fussily, that is normal when younger, you only have to look on Mumsnet to see proof of it. If she only eats cheerios for breakfast, why not just leave her to it, and eat something else interesting yourself...you might find she wants to try what is on your plate. Kids love interacting at meals, and sometimes interacting negatively gets them the attention they crave, so try not to get involved in any mealtime battles, it is soo counterproductive. You literally cannot make a toddler eat something they don't want to eat, and they may well become phobic if you make a fuss.
It is a such a special time, but it can feel like a slog when you are pregnant
but you will look back and realise it was a special time never to be repeated just you two together, enjoy it!