TL;DR: girl says I make her feel fat and old therefore doesn't know if she wants to go on another date. Shit test or nah?

So I've been lurking for a few months, slowly digesting the pill and reading the side bar. I thought this would be the best place to come for advice for my current problem. If there's a problem with the way I've laid this all out then correct it.

So to get into it, on Tuesday I started talking to a girl via online dating, I only use it for quick lays, after a bit of chatting she gives me her number and asks me to come along to a rock night at a bar near hers on Friday.

Skip to Thursday and she asks me if I'm free to get a drink and get to know each other, I find it weird but it's cool I'm not busy so I agree. It goes fine no fuck ups or shit tests so far she seems into me.

Then Friday comes, we went to the rock show, she started buying me beers, I told her I couldn't drink as I was driving, she said I could stay at hers, I humbly accept the drinks, no clue needed to what happened at the end of the night.

Skip to today, this is where it gets weird, she texts me some small talk "hey" "how're you" the usual shit, I respond with appropriate responses, she replies after a few hours with "you should escape while you can" this got some alarm bells ringing, out of curiosity I ask why, she then says "I feel weird with you, I'm not trying to let the age gap bother me but it is, I feel like a beached whale compared to you" (wut???)

I've brushed it off with " whatever makes you comfortable babe" probably not the best reply but I was busy at the time and couldn't be bothered to deal with it, she said she honestly didn't know what to do, I told her to hit me up when she started to act her age.

So is this a shit test, not interested or a serious red flag? What am I missing? Should I soft next?

TL;DR: girl says I make her feel fat and old therefore doesn't know if she wants to go on another date. Shit test or nah?