As you stated, the guard could compel her to attend the House when in session.
It was her decision to stay in the House chamber overnight. She could go to her office. It was a "good trouble" type thing.
Gene Wu stayed with her overnight. They turned the cameras off around 1 am. The next day, some of her colleagues tore up their guard permission slips and were thus compelled to stay in the Capitol, and so five of them spent the night etc.
Gene Wu also had guards assigned to him. Every Democrat (except five) had guards assigned to them. The guards followed them around and made sure they went to the Capitol etc. The Democrats were under surveillance, but they were free to do whatever in their free time as long as they did not leave the state. Several of them dragged their guards to a Stonewall meeting at a gay bar in Dallas https://www.chron.com/culture/article/texas-democrats-nicole-collier-venton-jones-20826217.php
The DPS antics come as Collier refused to leave the House floor, spending two nights living out of the chamber, though she was also permitted to visit her office. Collier was joined by several other Democratic representatives, who shredded their previously signed permission slips and re-entered the House chamber to protest
I believe the guard duty ended on Wednesday. Democrats are no longer under guard since the bill passed. They also are not compelled to attend. They told the Speaker they would only break quorum for bills that threaten Democracy and they would only break quorum for the redistricting bill. When they came back, they told the Speaker they would attend the session and that they didn't need guards because they had their word. But they were assigned guards anyway. Apparently, the members are supposed to pay for the guards, but I think that will be challenged.
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