Text message from the girl I fell in love with disappeared from my Iphone

Hi guys,

Here's the situation: I met a girl on a festival, she is an angel and can't stop thinking about her... I wanted to save a contact to her, but unfortunately my battery was dead (iphone 7 battery life on new iOS is a joke haha 😁). So she sent me a message (NOT iMessage, she didn't have an iphone, it was just a regular SMS).

When I turned on my iPhone I got her message as a notification (on the locked screen) with her number and everything, but when I clicked at it, the phone lagged for a moment, and then it displayed just a general "Messages" view. The message from her wasn't there. *** happened, couldn't it be more of a bad luck 😢

Technical details: In Settings I've had the option to store messages forever, didn't have iCloud backup for messages. So far I've tried different things - recovering messages with DrFone, also checked the connection history on my mobile's operator, but it only shows inbound (due to the law)... I don't know what could I do more...

Question: Is there any other way to retrieve the message or a notification. I just need her number. An information like the number and sent time would be enough. Or maybe I could extract Notifcation history from the iphone? Any other programs for SMS recovery?

Please help, I want to marry her and due to some crazy bug I'm going crazy...