Yes, MAQUILADORAS is a Scrabble word!

Letter values in Scrabble US: M 3, A 1, Q 10, U 1, I 1, L 1, A 1, D 2, O 1, R 1, A 1, S 1.

Is it a valid word?

MAQUILADORAS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

an assembly plant in Mexico (near the United States border); parts are shipped into Mexico and the finished product is shipped back across the border