For Celta Vigo I really believe they will probably continue positive trend to not losing, I mean they will be consistent in the rest of this season so I also think they won't have much to do with relegation although theoretically it could happen. For Girona and Mallorca it seems these both teams will also stay in La Liga, but yes I agree that they are still unsafe because the current points are also not too far from Valencia, also their performance is not very consistent lately.
In the remaining 12 matches, everything is very likely to happen which team will eventually have to be relegated, and I see that starting from 13th ranking and below they are all not safe from the relegation zone because there are only very few points difference, unlike Celta who has more points of the teams that are struggling from that zone, but the saddest thing is to see how Valencia has been so bad this season and if they do go down this season then it's a setback and a change of coach doesn't seem to give the satisfactory results as expected until now.
Which three teams will be in the relegation zone is still completely uncertain. However, Elche does not see any chance of getting out of the relegation zone. They are the last team in the points table. Only 13 points in 26 games. And their performance is very poor. However, Valencia and Almeria have a chance to climb out of the relegation zone if they perform well and win a few matches. Valencia is only 3 points behind Getafe in 13th place in the table. If a team can win 2/3 matches in a row then I think they can move to a safe distance from the relegation zone.