is there a way to add a password to limewire to prevent my daughter from downloading files i do not want on my computer or to protect files downloaded in library from her deleting them

All you can do is set up a separate user account for her on your computer with you as administrator.. Exactly how you do this and what is possible depends on your Platform and OS.

Sorry to be little help

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To get Phex Click on the Fox

Is that really "all you can do?"

How about doing what the topic starter requested, i.e. provide password feature for limewire "to prevent children from downlading files we don't want"?

It doesn't take a genius to add this feature when you have a fully developed software.

This has been the most POPULAR requested feature for limewire, yet it is taking so long. See this tread for a collection of threads where this feature has been requested:

Password protection (parental controls) request for filters