At 50 and 5ft 3 you don't have much room for manouver in your calorie allowance even with 88lb still to go
My advice is to be extremely accurate in calorie tracking, eg if you use oil for cooking, measure that splash exactly by weighing the bottle before and after - no guesswork, ever. Use USDA verified calorie amounts if you use a tracking app.
This made all the difference for me and I've lost 8.5 stone altogether (I think.. about 126lbs) using 16:8 fasting and lower carb, plus calorie tracking
to lose 1lb you need to be 1000 calories under your TDEE and that keeps changing as your weight changes, so recalculate every few weeks
I also don't weight myself weekly - I weight monthly - this evens out salt/exercise/hormone related water retention weight etc and gives my scales a chance at fully picking up on whats been lost.
start viewing 1lb as a lot - it honestly is and is a more realistic goal per week (or 4lb ish per month)
at some point, especially as you get closer to goal, 2lb per month will be realistic and to be celebrated. Keeping going and adjusting mindset is the whole battle.
and don't be put off by how long it takes - the time will pass anyway whether you do or you don't keep persevering