It is so difficult, isn't it? I have struggled with my weight most of my adult life, not helped by a couple of medical conditions, so I sympathise with both of you. I have been reading Why We Like To Eat (Too Much) by Dr. Andrew Jenkinson, a bariatric surgeon. Through his patients he has come to realise that a lot of dietary advice is simply wrong and has done a lot of research on the subject. He says that it really is not as simple as "eat less, move more" and that the advice to cut down drastically on fat is wrong as low fat products mean that we eat more sugar, the real enemy, as a by-product. He says that in the late sixties, when doctors and scientists were researching how to reduce the shockingly high rates of heart attacks, a SUGAR COMPANY funded the money to "prove" that fat was the culprit and suppressed any research into the I'll effects of sugar. He says that the way to reduce weight is to reduce the natural weight set point we all have by getting back to cooking real foods with no snacking. Slowly and surely, so that the weight stays off and does not return.
For myself, having been encouraged by a friend's dramatic weight loss, I have been intermittent fasting 16/8 since early November. This means you can eat between midday and 8pm, although it is flexible, according to your daily routines. I do not possess bathroom scales, l go by my clothes and the weight loss is noticeable. I have reduced a dress size. I hope this is not too long-winded, but l was trying to give the OP a different take on things to help herself and her daughter.