No, Carmen does not return to The L Word or its sequel series, The L Word: Generation Q, after her initial departure from the original show.
Carmen's Absence from The L Word Franchise
Carmen de la Pica Morales quickly became a fan-favorite character in the original The L Word series, but her storyline concluded abruptly. After being jilted at the altar by Shane McCutcheon, Carmen vanished from the original show and was not seen again.
Despite significant fan desire and a strong sentiment that she was one of the characters most wanted to reappear, Carmen did not make an appearance in The L Word: Generation Q, the sequel series that aired years later. Her continued absence from the franchise has only intensified the hope among viewers that she might return in a potential future series spinoff, making her comeback a highly anticipated event for many dedicated fans.