Fourth behind the SNP in some cases.
Holy shit I hadn't checked in a few weeks, but yeah if an election was held tomorrow they could potentially finish third: https://www.electoralcalculus.co.uk/prediction_main.html
There's a map here that graphically shows just what a wipeout it would be: https://twitter.com/ElectionMapsUK/status/158203973484657459...
She's had a terrible week (and that's saying something given her premiership to date).
She had to sack the chancellor that enacted all of her campaign promises, bring in a new chancellor who has undone all of her campaign promises.
Some of the polls coming out suggest the Conservatives would be in 3rd place at a General Election behind the SNP.