Is This Ok? Period Talk...

It's normal for their cycles to be abnormal for the first year. Be aware that she may have heavier periods when she has longer times between them. Aleve can help with that.
Look for some books that will provide you both with some information. (Check Borders, because they are going out of business)
Also, girls usually follow their mother for menses and pregnancies, so what were yours like early on?

When she complains about the mild cramps & headaches do you (or she) notice a dark, maybe brownish discharge in her underwear? If so, that is her menses. Her hormones are like a loose power line looking for it's connection. As her hormones mature and become more regular so should her cycles. If, after a few years they don't or she has debilitating menses, then have her evaluated. One of the things that I learned from using Bio-Identical hormone replacement, it that it can also be used to for menstruating females with dysfunctional menses. Just something to keep in the back of your mind.

I think it's fine. Sometimes at that age the periods can be pretty irregular. As long as you have zero concerns that she's sexually active I'd let it go and it'll probably return in another month or two.

It's perfectly normal for a girl's periods to be irregular, and to even skip a couple of months at first.

I went several months between my first and second periods. As a matter of fact, I was SO irregular that eventually I had to get on birth control pills just to get my body regulated. I would maybe just keep track on a calendar (if you aren't doing that already). My daughter is 11 also, and I have been wondering when the time will come!

Yes, normal. It can take months for things to adjust.

Yes. Very normal. Her body is adjusting. It might even be a few more months before she finally becomes regular. It happened to me and to my sister.

Totally normal to be irregular at first while their body is adjusting. I was very irregular for the first year or so when I first started my period too; I don't think it regulated for about a year or so actually. I had a couple of light periods, then about 4-5 months later I started having the heavier periods and started to become more regular. Like someone else mentioned, maybe keep track on a calendar so you can try to identify any possible pattern for now.

My daughter had her first period at about 10 1/2. She hasn't had it since - but it was really just spotting. I was very irregular to - I don't think I was regular every month until I was about 14.