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Alessa has it down.
Each time you put a betta in with neons, you're taking a huge chance. If someone is insistent on doing something like this, I always say that that person should be prepared to split the two groups if something goes wrong. In your case, you need to think about whether or not you'd even be able to do so. I'm guessing that your mom doesn't want you adding another tank until you've had one going (without problems) for a significant amount of time, and I wouldn't blame her.
Aside from this, though, you should be focusing on your betta, not on what you'll be getting next. When my last betta, Sun Ce, died, it was several weeks before my wife and I decided we were going to get another betta to put in the tank.
If the worst happens and your betta doesn't make it, give it some time and make sure you've got your tank well-balanced. Remember how the past few days have been, and remind yourself that rushing to add more fish will likely result in similar circumstances.
In the end, if you find yourself with a tank sans betta, and you have given the tank a couple of weeks to verify that it's stable, up the neon count to no more than 6. You can do a mix of regular neons and black neons for variety. They will school together.
If you want something interesting about the tank, think about upgrading it to a planted tank. You can get low-light plants like Java fern and Java moss for pretty cheap. Neons swimming through the fronds of Java moss are really, really pretty.
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