Troy Aikman's Ex -- Allegedly WASTED in a High School Parking Lot

Troy Aikman's ex-wife was drunk off her ass at 9:30 AM ... when she was arrested for public intoxication in a high school parking lot in Texas ... this according to the police report obtained by TMZ.

According to the doc, the Murphy Police Dept. claims officers were dispatched to McMillen High School around 9:30 AM on Monday ... to check out a suspicious vehicle in the parking lot.

When cops arrived to the scene, they discovered Rhonda Aikman in the driver's seat ... with the engine turned off.

Officers claim Rhonda "fumbled" to open the door ... but once she did, cops say they could immediately "smell a strong odor of alcohol emitting from the vehicle."

In the report, cops say Rhonda was slurring her words when she talked and had little control over her body movement. Still, cops say Rhonda denied being under the influence of drugs or alcohol.

Cops asked her to step out of the vehicle, but she allegedly refused ... so two cops "forcefully removed" her from the car.

Cops then determined she was a danger to herself and others and was arrested for public intoxication.

According to the report, cops went through Rhonda's vehicle and found 2 water bottles half filled with a yellow liquid that was cold and smelled like alcohol. They also allegedly found a bottle of Colozapam ... a prescription drug commonly used to treat seizures and panic disorders.

Cops say they also found a small dog in the car. The dog was transported to a police animal shelter. The dog has since been recovered.

Aikman was reportedly cooperative once she arrived to the police station. She has been released from custody.