Was the defendant's guilty plea voluntary when she did not know the mens rea for the charged offense?

QUESTION PRESENTED In Texas, the ens rea for attempted capital murder is a specific intent to kill. The defendant did not know this. Thus, she pled guilty although she had no such intent. She would not have pled had she known the ens rea and that expert testimony could support her claim of no intent to kill. Was the defendant’s guilty plea voluntary when she did not know the mens rea for the charged offense? 2