Bowie, the co-commander of the Texian forces, collapsed from illness on the second day of the siege; Alsbury nursed him throughout the remainder of the siege. On March 4, Texian co-commander William Barret Travis sent her as an emissary to Mexican commander Antonio Lopez de Santa Anna to negotiate an honorable surrender for the Texian forces.
The commander of the Texian army, Bowie, became incapacitated on the second day of the siege; Alsbury tended to him throughout the rest of the siege. On March 4, William Barret Travis sent her as an ambassador to Mexican commander Antonio Lopez de Santa Anna to discuss a honorable capitulation for the Texian troops.