Update: So the next setup I've put in my daughter's racket is Ghostwire 1.17 / Wilson Syn Gut 1.25. I had discovered this somewhat by accident since I had GW lying around as a cross for me (I didn't like it myself as a cross with HG but I've previously liked GW 1.22 as a full bed). Anyway - there's something really nice about this, at least freshly strung (I've hit with it myself); way nicer than other hybrids Ive tried. When I've tried a heavily shaped main (yonex poly tour spin) with syn gut it just didn't produce much spin. I will definitely stick with round polys if I do poly/SG. Heck I might try this hybrid in my own racket.
Also, at latest count, she's breaking syn gut every 3.5-4 weeks now. So I realized from a stringing cost perspective, I could justify just restringing a full bed of 1.10 or 1.15 gauge poly once a month; GW 1.1 would be a great candidate as suggested). So the "play until it breaks" premise might be somewhat moot. I'd also look at PTP 1.15, and 1.10 or 1.15 of Solinco HG/Conf/TB.
As to stringing machine: I'm going to wait until it's inevitable
My guy in chinatown delivers and picks up for $15 so at least until he raises his rates. But I do plan to get reels at some point sooner.