Keeping No Deal in play may be the only way to keep the Tory party together at this point, unfortunately. There is no obvious motivation for ERG and the DUP to not simply run down the clock at that point, if she isn't going to threaten them with a general election or second referendum, because Article 50 can only be revoked up to March 29th. The pro-Remain majority in the HoC needs to assert itself next week or it will almost certainly be too late after that even if the short extension is granted. She maybe wants to engineer a revocation for petty electoral reasons, so the opposition parties that push for it get viewed as traitors defying democracy by Leave voters, but I suspect Corbyn will not be willing to play along, unfortunately.