Can a Texas judge revoke probation if delinquent in restitution fees?

I was given 10 years probation and no restitution by a jury, but the judge gave me a large restitution in spite of the jury decision.. I have been on probation 5 years succesfully but unable to pay the 1,500 a month ordered by the judge. She now said if I don't pay a substantial amount of money in 90 days she will revoke my probation and put me in prison. I was told 5 years ago by my attorney that she could not revoke me if I could not afford to pay all money. Please help me with info. I am a 47 year old grandmother, I work hard and pay all I can. I have been in no other trouble.