Have you also tried lowering your nic level? As for vaping plain pg,vg and nic. Nothing wrong with that. Did it for over 6 months back in the day. Wasn't horrible :)
The icare solo doesn't do well past vg/pg 70/30 juices. Anything higher in vg and coil starts getting burned. If you would like to thin her juice down a bit you can just add some PG (propylene glycol), shake the crumpets out of it, leave for a day or so and she can vape.