The way I see it, TFC is right that there probably is lots of international players out there who could win this Abby girl. Some of them same age, some of them younger. I've seen players around 10 who are ways ahead of her, winning european tournaments u 12, and I would be very surprised if they would not win Abby.
If some of those international girls cabable of beating Abby are only 8, I'm not sure, but I wouldn't say it's impossible, I've seen some of the girls mature very early physically.
And psychologically, I'd say that some of those younger girls I 've seen wouldn't feel any pressure whatsoever facing Abby, quite the contrary.
When it comes to Db, never seen him anywhere but in videos, so difficult to say for sure if he has a real chance or not, but I hope all the best for him and his team. I respect their all in attitude very much, they've got balls.
At the same time, because couple of my friends did it and one is trying to do it right know, I do know that trying to make it through the futures and challengers (one of those friends made it atp top 100, others 100-250, all top 5 euro kids originally) is something I wouldn't push my kid into instead of free college unless my kid was top 10 ITF. Being 'only' almost top european seems to mean nothing. Maybe it's different if you're American I don't know...