Is an email and phone call enough?

I have a decision to make - it seems like decisionmaking is all I've been doing lately, making decision after decision. Last week I got a phone call from someone who knows my missing person. They had sent an email to her email address and received a response back. I called the detective and she said she spoke with my missing person on the phone. A part of me wants to be relieved, she's okay! But the pieces don't add up. The email said she is still living in this man's home. If that is true, why did he tell three people (including the police) she wasn't living there? Can anyone really know by an email or phone conversation? Are they really talking to the woman? Is she okay? I don't want to be overdramatic, but I want someone to lay eyes on her and tell me she is okay. I, of course, don't have a picture. This poses a challenge because without a photo how would the detective know for certain? The question is what to do next? Should I pursue it further? A woman may still be in danger and he may succeed in further isolating her. The answer is still unknown.