score:2
It is fine. This possibility is explicit in the definition of the L visa category. Like every other nonimmigrant visa category, it is defined in 8 USC 1101(a)(15). The relevant paragraph is 8 USC 1101(a)(15)(L):
(L) subject to section 1184(c)(2) of this title, an alien who, within 3 years preceding the time of his application for admission into the United States, has been employed continuously for one year by a firm or corporation or other legal entity or an affiliate or subsidiary thereof and who seeks to enter the United States temporarily in order to continue to render his services to the same employer or a subsidiary or affiliate thereof in a capacity that is managerial, executive, or involves specialized knowledge, and the alien spouse and minor children of any such alien if accompanying him or following to join him;
(Emphasis added)
Upvote:2
Yes; you are free to travel separately. We have done that dozens of times.
The visa are given to the persons, and are valid for each person separately. You do not need to arrive together or even travel to the same places.
Her visa is a dependant visa; so if you do something that affects the visa basis (like getting a divorce), the situation might change, but if so, travelling together again has no effect on it.