how much dose it cost to renew passport and get visa for a trip to the uk

How much is she telling you it costs?

Very inexpensive.

Having said that, Google dating scams in Ghana, or just scams from Ghana. You'll get hundreds of pages of reading material on the subject.

In other words, it's a scam. You're probably not even talking to a woman. If you are, she's talking to hundreds of other guys also asking them to fund her to come see them. She'll never ever show, she'll just have more issues that need more funding, until you figure it out and cut the purse strings, which is when she'll just stop contacting you.

Ok, renew a passport of what country,
I can renew my US passport there, a person can renew a UK passport there.

A visa is gotten from the UK embassy.

The total to renew a Ghana passport and get a visa for UK, is about 300 USD.