Hi SQ
Also 5ft 4" and recently was totally shocked to discover I was 13 stone. I had Covid in March and was 'bed-bound' for a couple of weeks, and then a wee bit sluggish for a while, and this seemed to result in a 1.5 stone weight gain. However, when I say sluggish, I mean as a full-time teacher running around a lot, just not with the energy for super long dog walks in the evening. For reasons that are too tedious to go into, I found myself working across different sites for three weeks with no access to the canteen, so I switched to yoghurt, fruit, oatcakes (for convenience) and then my usual evening meal. Honestly, the weight fell off me (like a stone in 4 weeks) and I wasn't counting calories ...
^^ I've been desperate for a while to get under 10 stone (most of my life I've been around 8, but this changed in peri) and so am relatively accustomed to counting calories and feeling rubbish about my ever increasing 'middle-aged spread'. It felt as if nothing really seemed to work (plant-based diet, time in the gym, Couch to 5K, etc), and then this. I don't know what to make of it, but I'm currently going with 'refined carbs, e.g. bread, don't seem to suit me'.
I've now re-joined a gym (summer holidays, suffering from lack of structure) and will mostly concentrate on building my muscle mass, with half an eye on eating a relatively high protein diet to accomplish this. My son-in-law is a huge hulk of a man, and he says that it's muscles which burn calories most effectively, and so while cardio is great for heart and overall health, it doesn't really do much in the way of creating the conditions for 'fat burning'. S-I-L also tells me not to diet, as this puts the body into a different kind of input/output relationship, over complicates the effort in some way.
TLDR, rowing machines and weight machines alongside the cardio.