How are you measuring temps?
A sign of a RI is noticable wheezing, so I would just keep an eye on her (and an ear out) to see if her breathing becomes louder, more noticable, raspy and otherwise not normal (if you hear a whistling sound as well), or is followed by any visible bubbles or excessive mucus. I would even take a peek inside her mouth and see how her throat and trachea looks.
Sometimes they'll make a whistle sound if they just took a drink and is expelling water from their nostrils OR a piece of stuck shed it making a sound while the snake breathes (if your snake just shed).