Eh, well, it depends on the context... if it was an "informational date" and you correctly kept it short (say 30min) and built a lot of intrigue and closed things out on a high point and on your terms... why, just go ahead and set up the real date.
On the other hand if it's the real date and it didn't end up in sex then I would say damage control is called for, I mean I know this is quite a crushing realization when you are still levelling up and getting experience in running dates, your approaches still a bit hit-and-miss, still a bit in scarcity... and it feels like things went well and you've put a few solid bricks in the wall of attraction you're building... well, it's rarely what it seems. More than likely some window was missed, leaving her disappointed and venomous while still professing great attraction... be very suspicious mate. (OTOH she may be legit of course).
Put it this way, every date that doesn't end in sex will roughly halve your chances of eventually getting sex, I don't have hard numbers but that's one way to think of it anyway. I can personally attest to this, see my early FRs with women named [L] and [C] for instance. However, all is not lost -- I highly recommend you read the article on date compression and follow it.
As to more immediate, specific advice... most importantly, be willing to let her go... you are very invested after a date that went well from your perspective... this does not mean she is your best chance of getting sex right now, or ever, or even that she is a worthwhile use of your time, and effort. Having got that established... do not send rapport building texts, they will make you look even weaker and less decisive. Set up another meet, but I would not chance it to text, maybe ring her at a carefully chosen time of day and see if you can recapture some of the good feelings and assess her sincerity and ask her out on a high point? Tall order I know. Depends how confident you are, really. Give it a shot?
This post may come under the category "tough love" but I hope it helps. Of course I could have completely misunderstood your question, but above seems the likely scenario to me?
-Ray
Edit: Am coming around to the view that it's not a good idea to leave voicemail, in the last couple of days rang a variety of women in various stages (cold approach hopeful... buyer's remorse chick... failed to smash LMR chick... warm chick etc) and they didn't pick up, probably deliberately and I left voice messages and probably scuppered what little chance I had, its higher investment than text + allows them to sit back and screen you instead of answering your call, if u just don't leave a message then it may build intrigue, not really sure (two funny things though, firstly I got a missed call last night followed by a text "I just tried to call you" this was some funny shit, but don't do that!!! also, warm chick texted me with a good excuse right while I was writing this edit, so guess voicemail can be okay).