Any reason you went with the Tec if all she's done so far is single tank backmount? The bladder looks like it's just way too big. I'd sell the bladder and pick up a Classic bladder. It will be easier for her to reach the dump, and should be more than enough lift for what you're doing.
EDIT: Is that with it locked down correctly? It looks like it's splayed way far out, like it's not laying against get sides. Who fit it to her, it looks like it's not adjusted correctly to start with. This may just be a case of buying the wrong tool for the job. But I guess at this point might as well try and make it work if you can't find someone to swap with you.
Could always hit up SJ Alice Bennet (crystalpeaceburger on instagram) and ask how she deals with it. She's a pretty tiny human. Also post on the xDeep facebook group, post the photos, there are some smart cookies over there too, including the dude that designed it, and the manufacturer.
EDIT: Is that with it locked down correctly? It looks like it's splayed way far out, like it's not laying against get sides. Who fit it to her, it looks like it's not adjusted correctly to start with. This may just be a case of buying the wrong tool for the job. But I guess at this point might as well try and make it work if you can't find someone to swap with you.
Could always hit up SJ Alice Bennet (crystalpeaceburger on instagram) and ask how she deals with it. She's a pretty tiny human. Also post on the xDeep facebook group, post the photos, there are some smart cookies over there too, including the dude that designed it, and the manufacturer.