Hi there,
Sorry, I haven't noticed you're replied again. Just came back from a meeting with fellow cancer patients.
She'll probably give birth again after a gestation of approx. 3-5 weeks. Sometimes even 6 weeks. It does differ from each individual fish to individual fish. She decides when a pregnancy will be established by using a stored sperm package 9if she's still storing one or ore of those packages of course). A lot of people would say every 4 weeks but it's totally up to the female itself wether that's gonna happen or not. She can even withhold a pregnancy if she doesn't feel comfortable enough. So, that would mean a delay in the duration of the pregnancy.
I guess, you'll just have to be patient to see these coming days if more fry will show itself. If nothing will be eaten, make sure they can hide themselves. Unless, the adults in the tank will leave them alone (which can happen as well). Not always, will fry be eaten.
Looking at the picture, I'm not sure wether the tetra is pregnant or bloated. Female tetras tend to have a swollen abdomen when carrying eggs. But still hard to tell by the picture shown.