It's definitely a German blue ram. They can go very dark like this when they are feeling stressed or unwell, although you do find a very few which always have this dark coloration. It may be that in the tank at the lfs
she was one of the lower end of the hierarchy and so was getting picked on, or may just be a poorly fish. Now, she's just had a move to a new home which is another very stressful time, which could add to the dark stressy colour. She may well colour up in a few days once she settles in.