AOS - that was Lawless one and only appearance - TVLine, except.....
TV Line is saying that Lucy's appearance in episode one of AOS was Lucy's one and only appearance:
I was so surprised that Lucy Lawless’ character died in the Agents of S.H.I.E.L.D. season premiere! Is there a chance to see her in any of the following episodes? Or is there any chance to watch Lucy on other shows, like Parks and Recreation? –Natalie
Sorry, but plan to be Hartley-broken – that was Lawless’ one and only appearance.
http://tvline.com/2014/09/25/once-upon-a-time-season-4-spoilers-regina -show-white-emma-flashbacks/
Except, showrunner Jed Whedon in a previous interview said that she'll be doing an arc. Around 1:45 into this video on this site:
http://www.hitfix.com/news/agents-of-shield-creators-tease-lucy-lawles ss-badass-character-isabelle-hartley?
So which is it? Usually TV Line is spot on. But with the showrunner Jed Whedon saying that, it leaves me wondering.
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The smaller the mind the greater the conceit -Aesop [biggrin] Just sayin!