I think she may have staying power as the sole contender left for the anyone-but-trump groups to get behind, plus it's good for her national profile. Probably stick around til super Tuesday at least which is only 6 weeks away but possible even longer even if she's losing, if her financial backers don't dip. And also if it's a closer race than expected then she may not even concede as a lot of shenanigans go on at the national convention.