Ok, so your daughter's MIL sounds like she was unsupported and chose not to inform herself, despite being given all of the information - although to be fair you don't actually know that, you are speculating.
Despite all of that, she has been successful losing the weight and now has some decisions to make about how to maintain her weightloss.
Your husband is clearly very fortunate to be one of the lucky few who is receiving GLP medications via the NHS. The medication is the same, as it will be via an online provider though, so what is your concern for your morbidly obese friend?
How do you think your MIL and your morbidly obese friend could be better supported? That was afterall, the main point of the paper published this week, to consider how better we could do this.