new goals for this year and need a little advice. ..

First some background info.... have been on my weight loss journey for over a year now.
(This time around) I am about 10 pounds or so away from my goal weight. I know what it takes to lose weight and my workouts include zumba, yoga, running, elliptical, walking and weights. I usually do more of the cardio; however, this year I want to do more with weights. I have a friend that helps me with the weights and form. She thinks I don't eat enough though.(she doesn't count calories) Currently I am on a deficit eating 1560 a day plus calories from exercise. I have a polar hrm to figure calories burned. I am 5 ft. 144 pounds, and i am set to lose 1/2 pound a week. Outside of exercise I would say I am lightly active as I am a stay at home , homeschooling mom. I do not sit on the couch all day I am up cleaning, teaching and I have a lot of animals I have to take care of so I am up and down all day.

I know a hrm isnt a good source of figuring calories burned. So how much extra should I eat back after strength training or should I bother eating extra? Would the 1560 calories be efficient after doing 30-60 minutes of strength training at the heaviest weight I can handle 10-12 reps and 2-3 sets? Or should I add 100-200 more calories?

Ideally I would like to lose 10-15 more pounds as well as tone, strengthen my body, and eventually build more muscle.

Thanks!