Skeptical the charge was real, then budget-anxious.

Willing to pay what's fair, and able over time but not in a lump sum. She has coverage and no hardship signals, so this is about trust, not money. She'll assume the bill is a mistake until it's explained.

Downside if wrong. Worst case if an inferred signal is wrong: one text sent at a suboptimal hour. No account is escalated, dunned, or charged based on an inference. 1 of 11 signals below are inferred; the rest are observed.