They had to make a quick call, in my book they acted boldly, the risks of the alternative were greater. Everyone has time to cool down and think about it, and the candidate can win if he is good. In the last few days all new information has pointed in the opposite direction.
They sat on this info for almost three weeks. Doing it now discards so much money and effort invested by people working the election stations, the people in other countries that already voted, etc. Not to mention that it communicates to the everyone that their vote doesn't count if it's not for the right candidate. A vote made under wrong assumptions is still a vote cast democratically. In my opinion this late decision makes a mocking of a real democratic process.
It's also very likely to have the side-effect of destroying Mrs. Lasconi's chances at the presidency. Who do you think that the Georgescu voters will vote for now? Not her for sure. I bet there will be a Simion vs. Ciolacu battle next time, and there we'll go again with choosing the "lesser of the two evils".
On the second point I completely agree with you. She appears to be collateral damage at this point. Perhaps that will raise sympathy and she can get into the second round again.