Just for fun, I thought I'd try using Scroll of Stamina V (Requires Level 60) on her. The buff succeeded, and as a lvl 55 she got a lvl 60 buff of +20 stamina.
This is a major twink bug, have a level 70 buff you with 20 Stamina.
I have not tried this with other scrolls, and I will probably try it later on tonight.
I currently have a gm ticket open, and will keep you up to date on what happens.
UPDATE - 30 minutes later
That has got to be the fastest GM reply I have ever received.....
22:30 [Lygyryne]: Greetings, *****, this is Game Master Lygyryne. I just received your petition, how are you doing?
22:30 [*****]: Hey.. doing alright.. that was a fast response
22:31 [*****]: Scroll of Stamina V can be used on lvl 55's... if you are grouped and lvl 70
22:31 [*****]: There may be other ways to use it
22:31 [*****]: And other scrolls can be effected
22:31 [*****]: *may be effected
22:31 [*****]: ***** in my group still has the buff
22:31 [*****]: (7 mins left on it)
22:33 [Lygyryne]: Hmm, give me a moment to check something, ok?
22:33 [*****]: Ok
22:35 [Lygyryne]: OK, well I do want to thank you very much for bringing this to my attention, *****.
22:35 [*****]: Ok.. so it is a bug?
22:35 [Lygyryne]: I've never heard of it before, so I'm goign to have it looked into and see if it is.
22:36 [*****]: Interesting....
22:36 [*****]: Yeah.. it sorta shocked me...
22:36 [*****]: Oh.. and I tried it twice
22:36 [*****]: So it's not just a one time.. server glitch type thing
22:37 [Lygyryne]: Cool, thanks again. Did you have anything else I should look into as well?
22:38 [*****]: Yeah.. can you get me [Schematic: Lil' Smoky] ? I've been trying to get that darn thing for the past 2 months..
22:38 [*****]: ;)
22:38 [Lygyryne]: If I could I would. ;)
22:38 [*****]: LOL.. Figured.. oh well. had to try
22:38 [*****]: heh
22:39 [*****]: Nope.. nothing else then
22:40 [*****]: If you guys need to get hold of me for anything... you can use my registered email address.. i'd be happy to help
22:40 [Lygyryne]: Thanks for playing WoW and happy hunting! Feel free to submit your feedback of our conversation by sending an email to firstname.lastname@example.org.
22:40 [*****]: Sounds good.. :)
22:40 [Lygyryne]: Sure thing, thanks again for your assistance.
22:40 [*****]: Not a prob