My girlfriend said my size should be BIGGER (r/Advice)

I'm in a long-distance relationship, and we're both from South Asia. For some context, we met in person about two years ago, and we had sex for the first time. Everything went smoothly, and neither of us mentioned any issues afterward.

A few days ago, while we were casually texting, she mentioned that my penis should be bigger than it is now. She said the girth was fine, but that it should be longer. It caught me off guard, but I didn't think much of it at the time. We laughed it off and moved on.

Today, she brought it up again. This time, I asked her what was wrong with it. She said, "Nothing is wrong with it, but it should be bigger. See if you can do something about it."

Honestly, I was taken aback. It made me feel insecure, especially because she brought it up more than once.

My question is: What could this mean? Does it suggest she has had previous sexual experiences and is comparing me to someone else, or is this something that's relatively normal for couples to talk about? I don't want to jump to conclusions, but I'm struggling to understand why she would say this.

For context, we're both Muslims, and we're from a part of South Asia where casual physical relationships are not common.

I'd appreciate honest opinions, especially from people who have been in long-distance relationships or have experienced similar conversations.