Is there something wrong with the sentence?

[Kristine May]

She said that Celeste was acting like a queen even inside the prison cell she even hired a “bulldog”.

[2006]

She said that Celeste was acting like a queen even inside the prison cell she even hired a “bulldog”.

Yes, at the least it needs some internal punctuation

[Kristine May]

So it should be:

She said that Celeste was acting like a queen even while inside the prison cell. She even hired a “bulldog”.

[2006]

So it should be:

She said that Celeste was acting like a queen even while inside the prison cell. She even hired a “bulldog”.

That's much better.