Height is apparently 4'11" in height, claims 28J.

Okay… let’s see…
She’s possibly taller than 4’11” (but photos can be deceptive, so maybe that is her correct height).
The top/bralet she’s wearing doesn’t give much away in terms of band/cups fit - as it’s not a “proper” bra, as such - although it does seem to have underwires.
28J is one of those “modern” bra sizes (ie. relatively new since about 2007/2008 - before that, sizes like 28J didn’t really exist). And I’ve seen women who can fit into a 28J, but can also fit into a 28HH, a 30HH or a 30J. Also, a 28J US is the same as a 28GG UK (give or take). Whereas a 28J UK is more like a 28M in the US, so it all depends if her bra size is UK or US. But a UK 28J would have much more projection, which she doesn’t have - her boobs look like they’re being pushed up and out. I’d like to see a back band, if possible.
However, even with this photo, I reckon she’s possibly more like a 28FF or 30FF (assuming she’s as small as she is).
I’m going to go with 30FF, depending on the bra and style.
PS all of my estimations will be UK bra sizes.