I need information on this person before I can proceed further. She has a Yahoo. Email address.

I very much doubt that they are a real person.

Ghana is home to many, many marriage/immigration scams, all designed to take your money.
Let it go. The pretty face in the picture probably isn't who you are dealing with anyway.

You need to not send any more money, if you already sent it, it is gone, there is no way to get it back, no legal action to take.

They have 1000's of people, many work in rooms together that use fake names, or names and ID's borrowed, stolen or bought, others use ID of family members, Often the person who is emailing may be a 60 year old man pretending to be a young girl, to get you to send money.

So proceed, Stop any emails, don't read them, don't answer them, and don't send any money