If the Dutch laws are anything like the British laws, as far as I am aware, if your mother gets her Dutch passport back, you should qualify too, and it would give you full rights to work and/or reside anywhere in the EU with almost no restrictions (any that I can think of). Not speaking Dutch is irrelevant. I have found tham an extremely patient people. They do not expect anybody from abroad to speak Dutch at all. They are so well educated and worldly that almost everybody appears to speak English (as well as a basketful of other languages)! It must have been bred out of you- like my Old English Sheepdog who had no idea what sheep were and whether they were to be afraid of!