If she couldn't win a state race in a perfect storm for Democrats, she's not going to win a federal race, which is extremely polarizing.
I think she should run for Governor again. Outgoing Deal had like a +30 approval right and Kemp squeaked it out by 1 point. Another four years of demographic changes and another four years to fine tune her GOTV operation and hopefully her lawsuit bringing changes to how we handle elections here and she can win.
2020 is too soon... I think Trump will carry it by 2-3. I'd rather have a sacrifical lamb like Teresa Tomlinson or Scott Holcomb go up against Perdue. Abrams is too precious of a candidate right now and if she loses a second statewide race in 2 years, it won't be a good look.
To me Senator (policy, legislative, etc) is a better fit for Abrams... considering she was House minority leader.
Also- with 2020 being an election year... and especially if Beto were to get the nomination and turn out to be as strong of a candidate as many of us think he will be... I think 2020 could be a good opportunity. Also- didn't most of the rural counties already have SKY HIGH turnout rates in the Gov race... So I'm not sure turnout would be much higher in some of the rural counties... where as any increase in the populated Atlanta metro area could have a big impact. If I was advising her... I would say 2020 is a good environment and worth the risk.