Hello Kidzpt,
Nope, no experience with TheraTogs AND Rett but with TheraTogs and trunkal hypotonia.
Looking at her age (16) and her size respectively I wonder whether she will have any major positional benefit from wearing them, e.g. a more stable and erect trunk in sitting.
I wonder whether this makes good for the considerable effort of customizing, fitting, repeated donning, re-fitting, washing etc. plus the elastic straps (which actually (used to ?) have little rebound) fizzle out pretty quickly.
Rather something for younger kids with milder presentation of hypotonia, ataxia and athetosis, both core and limb.
Hope this helps to discuss the pros and cons with the mother,
Cheers,
Henner