If today is the deadline, I'm not sure why you've already sent a text reminder AND an email reminder. Sometimes that just annoys people and they don't respond.
At this point, those who said they would let you know are either pushing the deadline or just aren't going to respond. Some people just wait to see if they get any other offers, frankly, and hold you off until the last minute (pushing the deadline). So the best thing to do is to assume they are not coming. Don't plan on them coming. If they show up, you have to absolutely looked completely shocked, pause for a full five seconds (a long time!) without saying anything, then quickly recover and say, "Oh my goodness. What a surprise. Well, by all means, come in. We'll set an extra place for you! Susie, my Jennifer will be so surprised and happy that you are here!" You then respond with incredible manners and consideration to those who have none. It doesn't solve your immediate problem but it will lessen the likelihood that they will do this again.
You can have a few lower-end goody bags for those who didn't reply, although you hate to penalize the child for the parents' bad manners. I don't believe in going overboard on goody bags anyway, and certainly not investing in a whole lot of extras for people who have not replied. We also never had huge parties (such as inviting the whole class) so we never gave the impression that it was almost an "open house" type of environment where people feel it just doesn't matter or you won't notice a few more people.
And if people fail to reply on 2 occasions, they don't get invited again. You tell your child the hard reality - Susie's family doesn't reply or they don't plan, so let's save our invitations for people who are likely to come.
I used to think that e-vites were less likely to get responses than paper invitations because the e-mail version seems like a lot more people are being invited and therefore a few RSVPs missing won't affect the total party. A paper invitation could get pinned to the bulletin board or stuck on the refrigerator, and it didn't get lost in a parent's in-box. But I'm not sure anymore, and mostly now I think the tide has turned and many people like e-vites so they can reply right then and there. When we get class lists and so on, they rarely include home addresses, just emails, so more and more we are in the exact position you mention of not having addresses. Recipients also know it's easy for you to electronically send out reminders - which you should absolutely not be in the position of doing. But here we are.
So I think you either tell your child who is NOT coming (because no RSVP means they didn't say yes), or you tell her you have no idea because they didn't reply. (Depends on her age and ability to absorb the concept.) That teaches her the frustration of being ignored and reduces the possibility that she will ever put others in that situation.
Personally, I don't re-invite people who didn't reply the last time. I am of course pleasant to them when our paths cross, but I assume I'm not too high on their priority list or they just really never learned manners and I'll be facing this every time. I move on.
Good luck and I hope the party is successful!