remember that we have a Prime Minister who was 100% pro-Remain right up to the day after the referendum, and is now 100% pro leave, even though she can't say what Brexit means or what terms the government wants or the country needs.
I'm sure she will be perfectly happy to change her belief again if the next referendum brings a different result, as, presumably will the rest of the MPs. She would probably be quite happy to be a Labour Prime Minister if the next election voted in a Labour government. However she might not get the opportunity.