Hi Catgirl,
How's it all going so far?
I also use MFP everyday, and the best advice I can give is to pre-filter your meal plans a day in advance so you know what you have to work with. It helps you keep on track and hopefully look forward to your next meal. Prepearing your own meals is cheaper, tastier and healthier.
With 1200 calories you may benefit from structuring your meals over 3 main and 2 snacks. Alongside this try and include protein in each meal.
Here's an example of what I follow and by the way I'm also 5ft 6 and a mother of 2!
Breakfast
Turkey bacon with boiled eggs
Snack
Apple with almond butter
Lunch
Chicken with brown rice pasta and veg
Snack
A good protein shake without the hidden sugars you get in manu high street brands
Dinner
Slamon & veg
This is just a guide so dont take it as gospel.
Remember to drink lots of water throughout the day. If you get hungry try eating some meat - strange as it may sound but I love going to my supermarket deli and buying slices of turkey or chicken. For a veggie option try carrot batons with Hummus.
I weigh my food too to stay on track. I'm sure you can do it and soon you will be able to increase your calories once your metabolism starts working faster.
Good luck and stay strong
xxx
PS. Doves Organic sell brown rice pasta which is better than the white kind and Tesco have a new healthy range section offering lots of protein and alternatives to bread/pasta etc.