Assuming it has a decent PSU i'd probably look at something like a used 1070 or 1080, or maybe a VEGA 56 or 64. On the cheaper end you could also look for a used RX 580 and I've recently seen quite a few deals on used r9 290/290x (a bit slower than the RX 580) for less than 100$, however they are basically room heater and they're older cards that were somewhat popular for mining so they might not be in the best condition.
If the PC doesn't have a decent PSU/no VGA power connectors at all, and you just want something that can kind of play games a used 750 Ti could be an option, especially since she doesn't really know what games she wants to play.
At any rate I wouldn't buy a new card right now, seeing as RDNA 2 and Ampere are right around the corner. Then again the 6600k is also starting to struggle in some modern games, which is probably not gonna get better given that the next gen consoles are gonna have some pretty kickass CPUs, so a new GPU would probably not make sense for the system anyway, especially given that you're on an uncertain budget.
As for games, really depends on what genres she likes.
Being a big fan of RPGs I would probably recommend games like Disco Elysium, or Pillars of Eternity, they should run on the IGPU
There are also some pretty cool Strategy games that rely heavily on single core CPU performance and don't really care about GPU power.
If she's looking for shooters, or open world action games she'll probably be stuck with older games or E-sports titles.
Antares8001 got a reaction from Cyberspirit in Looking for recommendations
