She's definitely a good recipient (like every counter girl, interesting enough, I still find Hypericum and Mirabilis the better counter girls).
I'm currently trying to grab every FG I can get to buy a dressbloom for Helenium, so my entire counter squad will be fully equiped with event jewelry.
As for raidbosses, there's only a few occasions where I nuke other peoples' raidbosses:
1) When there are way too many raidbosses (like during a raidboss event, though I only see a medium amount during the current one)
2) When a raidboss's timer is about to expire (for me, that's generally when there's less then half an hour left)
3) When raidbosses are exceptionally strong (like the summonable bosses a few events back)
4) When the maintenance notice appears (Better to nuke it than to let it expire during maintenance)
I merrily kick people from my friendslist when they nuke my raidbosses within minutes after spawning. It's very simple: If I wanted it nuked asap, I could've easily nuked it myself, or released it to public instead of to my friendslist.
But there are days when I don't see many raidbosses, not even after repeatedly switching equipment or giving presents, so chances are, that I'll want to hit my own raidboss again in half an hour, just for the daily. It's pretty frustrating to miss the daily by 1-2 raidbosses because of a nuker, so fuck em and kick em I say. Especially when they do it within minutes after spawning. After half an hour to an hour, then ah well, too bad. But when the boss hardly appeared, I simply get rid of the nuker.