You posted:
"[i]when starting up she is presented with a box that [u]has her name and password [b]entered[/b][/u]."
+
"she used to [u]just press enter[/u] and it continued to boot up."
BUT
"As she did [b]not have a password[/b] when it was setup[/i]"
THIS last bit doesn't make much sense - [b]if the password was entered for her, how could she have had no password?[/b]
Is there a possibility that she has started entering a different password?
You could try using Safe Mode: Press F8 repeatedly as soon as the Splash screen disappears. You will be presented with a black DOS screen with white letters, giving you a list of optional startup methods - choose Safe Mode.
By typing [u]Administrator[/u] into the 'Name Box' and leaving the 'Password Box' empty, then pressing Enter you will gain access to the Administrator level. From here you can access User Accounts from the Control Panel and perhaps create another account for your daughter, with or without a password as you so choose.
If the Administrator account has a Password stopping you from going any further, then I'm afraid you are on your own because the Peers at TechRepublic agreed long ago not to aid posters to circumvent any password-protected computer systems.
This is mainly due to the increasing numbers of computers that are stolen on a worldwide basis, and we have no way of knowing whether you are a legal owner or a thief.
But given how long you have been a member of TechRepublic I thought you would have already known this fact.
Best of luck anyway.
If all else fails you can always contact DELL.