Hello everyone and thank you all for your thoughts. I think I will do the test anyway, today her stools have been ok in the morning and in the afternoon, but just few minutes ago a very soft/sloppy yellowish stool appeared again

I wonder if it's the carrot and the piece of cucumber she managed to steal while I was making dinner

I really like the idea of the cold pressed food and I have read the thread and visited the Gentle and Healthy Dog websites. I like the idea of feeding Elsa with good food but of course, what could be my first choice, it could not agree with her tummy. I also like the idea because we are thinking of having another Dane in the summer and I have noticed that Gentle, for example, is a food for every size and every life stage.
As Dotty mentioned I will stick with Arden Grange for a bit, let's hope tonight episode was nothing serious and maybe caused by the veggies, and I hope the vet will decide to go for the test (I just want to be sure that Elsa is fine and she is not infested by parasites).
The breeder is a lovely lady and this was the first and as far as I know will be the last litter. Elsa's sister still live with her and she is on Hill's adult large breed, 800gr a day and apparently she is doing well. I hope I will be able to meet up soon so I can have an idea at what stage Elsa really is.
We have had a male Great Dane back in the ages (he left us about 13 years ago), and he was a huge super gentle giant (103cm at the shoulder and 110 kg of pure muscles); he grew up on Purina Pro Plan, eating like a horse and never had any issue....having Elsa now is like having a super petite Great Dane

I will also give a try to the green feeder to see how it goes.