Is it normal for my wife to want to see every performance of a band?

Hi,

Is it normal for my wife to want to go to every single live gig a band performs at?

We've been married 20 years and have 3 kids.

She never mentioned she liked this band (who had split) previously.

In the last 6 months, they got back together, and now she's on facebook every day, every night, posting comments to their page, etc, etc, and wants to go to every live performance, even if it means the kids having to sleep-over at grandpa's, the day before a school night.

She's totally loves lead singer (Jonny), and as we've been to 3 gigs already (I told her if she wants to go, I'll take her), I can see how flushed (face goes red) she gets when he's looking her way.
She insists on sitting right in the front row so he can see her,
and says she want him to remember her.

She's bought everything they have to offer (books, posters, jewelry,etc)

Since discovering the band, she definitely seems to be paying less attention to me (Im in good shape), and the whole thing is really getting in my nerves now.
In addition to some jealousy, I feel like she is going overboard.

I've told her how I felt, but she said its just a band she liked when she was young, and she's just happy they are back together for a limited time.

So, please let me know...
Is it normal for my wife to want to go to every single live gig a band performs at?