Good for her. That's my district. If she earns the nomination Shalala will almost certainly be elected, since the partisan index of FL-27 is +5 Democratic. That means the relationship between the district voting percentage in 2016 and how the nation voted.
The reason Ros-Lehtinen retired is she knew a Republican had very little chance in a district like that, given the situational influence of 2018. FL-27 is atop the list of districts most likely to flip. Massive favoritism. I've seen it pegged at 1/25 odds on one site that evaluates political math based on long term trends. Right now the ones considered toss up are districts with partisan index in the range of +7 Republican, like TX-7. So that means a gap of 12 points from FL-27.
An incumbent is very unlikely to overcome a 12 point gap in a negative national landscape.
BTW, I'm sure the geniuses at West End Zone are offering exactly that type of analysis.
https://en.wikipedia.org/wiki/Cook_Partisan_Voting_Index