Just saw the pic. A couple of different angles would be helpful, including a sole pic or few. Can't tell much from just this one sorry.
It appears that her toes aren't flaring at all, but that her quarters may be a little, as they may be a bit long. The walls should be only slightly protruding the sole, and this should be a uniform length right around, from heel to toe. Generally a horse's hooves are 'scooped' at the quarters - that is, they should be slightly shorter at the quarters than heel or toe, following the sole plane. It is generally more prominent in back feet. If the farrier is rasping them level from heel to toe, there is likely to be unhealthy pressure at the quarters.
It also appears that her heels may be a little high, and if she is being stood up on her toes, this will lead to too much pressure there, which can cause toe cracks.
Another thing, especially if you're in a damp area, is that the cracks may have become infected with thrush. If you don't treat infection, even if the horse is being well trimmed, it's likely to eat away inside & make it hard for the hoof to become healthy.