She kept the appointment and showed up at the café on time.
Tips
memory
守 (keep / guard) + 约 (appointment / promise) — 'guard the promise'. Same 守 turns up in 守信 (keep one's word) and 守时 (be punctual).
culture
Confucian moral vocabulary: keeping one's word (守约 / 守信) is one of the basic virtues. The reverse — 失约 (shīyuē, 'to lose the appointment') — means to miss or break a meeting.