No, not at her size. I doubt there's a single bra readily available on the market that would fit her at all. Wrangling herself into anything that 'kind of' fits would not on;y look awful (look around you at all the normal-sized women who wear the wrong size for an illustration, I can spot the too large band and too small cup thing at twenty paces) but be so uncomfortable. Women who say they hate bras because they're uncomfortable are always wearing the wrong size or shape or both. Imagine being Anna and already being uncomfortable as fuck in your body. Adding an ill-fitting bra would just exacerabte that. I think that's why she just wears those soft, useless bralettes. Those things are really for young, almost flat-chested women or are just for use slobbing around the house, they're not something most of us would ever consider wearing as everyday underwear for a reason. They offer no support or shape. I doubt Anna has much choice though. I can also see her rejecting the type of surgical-stocking-like old lady bras that come in white or nude, tops, that MAY have just fit her when she was a couple of sizes smaller than now, because she thinks she's a stylish fashionista and those things are truly depressing to look at.
Want to guess her band size? It will be way, way beyond what anything but the most highly specialized (as in, made to measure) manufacturers make and possibly not even then. She's probably something like a 50B. Not available anywhere, really. In my country, band sizes in the high street start at 30 if you're lucky (sometimes, a lot of the time it's 32) and go all the way up to maybe 40 or 42. Cup sizing can be odd, too. Lots of manufacturers seem to think girls with a small band size never get bigger than a D. And I've seen bras in larger band sizes offered without the option for a small cup size as if some women can't be fat or wide without having massive boulders for tits.
Those extenders don't really help either because they are not part of the actual bra and are unstable and weaken the support, and on top of that are myriad fit issues. She'd need a specific style that suits wider-spaced breasts. That's easy at say, 32C or 36DD, but not at her size. When you get into the industrial couture type of bra-making, you don't really get the choice the rest of the population gets either. It's going to be very basic, medical-looking things, no wonderbra type solutions and they will cost a fortune even if you can source and pay for them.