It's only six days now until Texas Democrats get to vote in the 2016 primary, and a new University of Texas / Texas Tribune Poll shows she still has a solid 10 to 17 point lead. The poll was done between February 12th and 19th of a random sample of 460 Democrats (324 likely voters). The margin of error for all Democrats is 4.57 points, and for likely voters is 5.44 points.
I could be wrong, but I think Hillary Clinton will take Texas by about a 12 to 13 point margin.
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Nate Silver at fivethirtyeight.com also sees an easy victory for Clinton in Texas. He says she has a 95% chance of winning the state (and his projected outcome is shown in the chart below).