Diet AND working out will play a major role in her fat loss.... Whether it’s fasted cardio + a protocol of hgh (2iu dosed through the day)
Or with the lipolysis benefits of anavar (specifically with visceral fat) ... but then again you are playing with fire of using AAS on a female just for the purposes of losing belly fat.
I would steer clear of clen, as a general rule. It could prove to be cardiotoxic and you don’t know what you’re dealing especially if this isn’t a fitness prone female.
Ozempic/semaglutide will help curb her appetite, mentally modify her eating habits (cravings etc) ... but this requires research on a dosing protocol, ramping up, monitoring her health, knowing the pitfalls and dangers ( decreased motility, paralysis), weighing thyroid cancer risks, etc etc
Theres serious health implications with any of your options, and then there is the potential of her eating right through the benefits of many of them or after she’s ran it.
If she wants to lose belly fat, without working out... she could simply start by modifying her diet first. Getting a checkup by a doctor, and then weighing her next options ... without any of that... at best it’s a waste of money, at worse she could do some irreversible damage or put her life at risk.