Alas, the above is not true in Texas if they have served more than half of the underlying sentence (including time on parole). It appears based on the poster's comments that she "only had three months to go" that she probably had. In this case, Texas caps the time on the revocation to the time remaining (after subtracting the time on parole).
In this case the result is probably the same but nevertheless that is not quite correct. It is irrelevant whether you have served half of your total
sentence, with or without parole. What matters is whether you have served half of your total
parole period and that only determines whether you get credit for that parole or "street time" against your sentence. It is entirely common for someone to serve more than half of their total sentence and still not get credit for their street time, leaving them years to serve on a revocation. For example consider if someone got sentenced to 20 years in prison and paroled after 4 (more common than you'd think.) They have 16 years of parole to serve. They get revoked after 7 years on parole. They have served a total of 11 years against a 20 so more than 50% of their sentence. But they completed less than half of their parole period so they may not get that 7 years credit. They are looking at potentially going back to prison for 16 years.
There is also the huge caveat that there is a long list of offenses or enhancements for which you never get your street time even if you get revoked on your very last day of parole. Unless I'm misreading the original poster, we don't know what offense this person was on parole for.