I have to say I agree with your friend...although babies can and do go thru alot of growth spurts the first year, so I don't like to rule out feeding...but at this age, anything more than 3 is excessive.
I also don't think it is something she will grow out of...once they know how to get mommy's attention, they will often continue to do so.
She is not waking because she is hungry, she is waking because she is now aware enough to know that 'mommy is not holding me and I really want to be held, so I'll cry and she'll hold me'.
I've read about and tried both 'no-cry-sleep-solution' and the modified CIO plans. I can say that no-cry is not for the weary. It requires you to stand over the crib for long periods of time...and to be honest...did not work for me.
With my first I did not want to do CIO either (who does?) but at 8 months I was soo exhausted and out of options and decided to give it a try. It seriously took 12 LONG (at the time) minutes and she slept through the whole night. Then next night she cried 5 minutes and slept the entire night. The 3rd night I put her in bed tired but not sleeping and she shocked me by not crying and sleeping 11 hours.
I know it does not happen this easily for every baby (my second took much longer) BUT I'm trying to say that you really won't know until you try. Sometimes I wonder if I had tried CIO at 6 months that I may have gotten 2 extra months of sleep, and wish I hadn't waited so long.
I won't ramble on about CIO anymore if you're still not wanting to try it. BUT if you are wanting more info...I have an ebook I can email you with steps on how to do a 'modified' CIO, just shoot me a private msg and let me know.
Best of luck to you!