Am I being a harsh & judgy friend?

My friend just had a baby. She told me that it was a result of a one night stand with a neighbour she was obsessed with.

The guy showed up for the birth in hospital and paid the bill. That was our only interaction so I can't say much about him. What I do know is that while they were neighbours he told my friend more than once that he wasn't interested in her but she was so into him and kept showing up to his place. The day they had sex she went with a bottle of vodka for them to drink and play cards.

The guy made it clear that he is ready to do his part but only after a paternity test is taken because he's been scammed before by a woman who claimed her baby was his and it turned out to be a lie. They set a date and time but my friend missed it and showed up 5 hours later. He had been calling her and she ignored his calls. She didn't even get the baby's sample taken yet the guy's sample had been taken.

He sent her a long email stating that it is now on her to reschedule and that he would not continue any further communication until there was proof of paternity.

I encouraged her to do the DNA test as soon as possible so that they could start coparenting. However, she never followed up with the DNA test. She insists that the baby is his, even emails him photos till he blocked her but she still won't do the test.

I just don't get it. And I don't know how to help her because it seems simple to me.

What am I missing? Why would she refuse to do the DNA test?