There are a few ways to "help" without actually costing money. Actual advice is priceless, i.e. how to budget, the effect of interest (both in terms of compound interest on savings but also on the cost of interest on loans/credit card debt etc), help her understand student finance (assuming she's going to Uni), helping her understand the implications of signing up for credit, loans, leases, etc including student accommodation in terms of checking the contract, becoming liable for damages/lack of cleaning, "joint and several" liability with other students in the flat if there is any damage, need for insurance of personal belongings etc.
Also, help her to get a good credit score for a few years' time when she'll need it, i.e. she needs to open a current account in her own name with a major bank and use it wisely, she needs to register with the local authority for voting as soon as she's old enough, she could do with a provisional driving licence as soon as she's 17 whether she intends to drive yet or not (good for ID proof, and also helps reduce motor insurance the longer she's held any kind of licence). She should apply for a credit card as soon as she gets a job - Martin Lewis's website has a couple of links for "guaranteed" acceptance credit cards and cards where she can "pre-apply" where it won't go down as a black mark if she's refused one. When she next gets a mobile phone/contract, put it in her name, even if you pay it yourself, as it goes on her credit score as a positive. Having a good credit score means she'll have more options in years to come when she needs credit, or loans, or financial contracts/leases, etc. Credit providers look down on people who don't have credit cards, contracts, etc as the mere fact of having access to credit and having contracts means you are more trusted (assuming you've not defaulted!).
Encourage her to find paid employment at the earliest possible age. Not only will that give her money to spend/save, it gives a sense of responsibility and, again, looks good on credit scores, as well as looking good on Uni applications and future job applications. Even one shift a week at McDonalds is better than nothing!
Encourage her to save some of any money she gets, such as birthdays and Christmas, put it in some kind of savings account and encourage her to watch it build up, rather than her just spending it on trivial stuff that will end up in landfill.
You may not actually be able to give her money, but you should be able to pass on lots of knowledge, hints/tips and life experience which will put her in a good position to make good decisions when the time comes. Avoiding making financial mistakes by giving good advice is just as important/beneficial as giving them a shedload of money.