Faora is quite a bit weaker than Clark even as of MoS and probably even Zod, so she would probably struggle to do any lasting damage to Thanos in hand to hand. But she does have a gargantuan speed advantage against him, and would likely not land a single blow. What it might come down to is stamina. Thanos has a lot of stamina, but Faora's should be virtually inexhaustible under Earth's atmosphere and in the sunlight. Thanos will tire from eating free punches and trying to tag a considerably faster and smaller foe, and will eventually be laid out.
https://www.youtube.com/watch?v=NL_4U5gwbmM
Minute 3:53 a Warthog was able to knock back and partially knock down the Kryptonian fellow (I forgot his name, the guy ain't that famous).
A punch from Thanos would mean dare news for the Kryptonian girl. Considering the fact that we never saw her speed blitz, I say Thanos catches her eventually.
I predict for a Loki ending for her.