Had she legally entered the US any other way (other than a C/D visa holder & a couple more), you could marry and start the Adjustment of Status process all over. However, that is not how the process works for a person who enters via a K-1.
Example: Had she entered the US via a spousal visa, you could marry and start the AOS process....or had she entered via B2 visa, you could marry and start the AOS process.