What is the best way to establish credit ?

Buy something and pay the payments on time. Or be a co-signer on something with her.

get department store/service station or if she can credit cards and pay off the full amount each month.. even if its a pack of gum

good luck

Get a secured credit card. Put down $1000 deposit for $1000 limit and they will report it to the credit bureaus. Easiest way to build credit from nothing.

buy stuff, pay it off.

rinse, lather, repeat.

have to have credit for that

You can get credit cards without credit. Just not very good ones.

there are many secured credit cards that she can get that will help establish positive trade lines in her credit.

*EDIT*
What detoxed said..

A few credit cards might help to speed things along quicker though since it shows she can handle multiple things instead of only one... better to have more positive info than none!

Secured cc's are an ok way to start, but you can get normal ones with high interest rates and service fees to start out. DO NOT pay off the full amount every month, cc companys frown on this because they dont make thier interest $$. Instead, get a small line cc (secured or otherwise) and make the min monthly payments for 3-6 months, check the fine print in the contract to see how often they review the accounts. DO NOT max it out anytime in the first year, keep balance roughly half of the available credit line.
If she needs a car, thier are tons of first time buyers credit programs. Stay away from the "buy here-pay here" places, as most of them do not report to credit agentcys,unless the account goes into the negative. I know most major car companies, Ford, GM,ect have good programs.
Store cc's from places like sears, J.C.Pennys ect are also fairly easy to get, just follow the same tips as normal cc's.
Following those tips, should result in at least an "A" credit rateing with in a year, and "AAA" in under five.
Hope that helps.

goto the bank get a 1k loan for 12 month term take the money put it in a CD for the bank for collateral. Wait 6 months do it a second time make all the payments on time. 18 months you should have decent credit at very little cost. I did that when I was 18 and purchased a 15k car with no co-signer and no money down when I was 20

Get credit cards....