Thanks to all! that's already something  :D

We can say that the first sentence is deciphered, it is the name of Natalija's sister (Ecaterina Ioana Ghica / Ekaterina Ioana Gika)

The second sentence stays a total mistery.

I already tried to compare with a glagolitic alphabet, but I don't think the letters are really similar (but i'm definitely not an expert!)
I'll try to check Romanian cyrillic.