Well, she wasn't short of work while she spent the year away from Trek, and I believe she did do some stage work, some film work (The Hunt For Red October - though a lot of her scenes were cut from the final film, and the J.J Abrams written comedy Filofax etc.)
But I don't think she left for those reasons. Unlike Denise Crosby, who had had several movie offers around the time.
'If the Apocalypse starts, beep me!' - Buffy Summers
'The sky's the limit.....' Jean-Luc Picard, 'All Good Things'
courtesy of Saquist