I'm trying to locate a supplier of a bed tray. Any guidance?

What kind of a bed tray are you looking for, can you be more specific? One that just sits on the bed with legs or one that is on the floor and moves over the bed?

I'm looking for a try with legs that she can hold while sitting eating and also be used to hold a book .

Well I just googled "small bed tray with legs" and got a ton of hits on Amazon. So try going to Amazondotcom and put in those search terms and you'll see lots of options at different price points.

On this site, under Elder Care, Senior Care Products. Kitchen & Eating, there were 2 trays shown, both adjustable to the person's size, with the link to the supplier's website.
https://www.agingcare.com/Kitchen-Eating