Final answer:
Paul's mother is not described in detail but she seems to be alive and well when he returns to her during his leave.
Step-by-step explanation:
When Paul returns to his mother during his leave, her exact condition is not described in the provided information. However, it can be inferred that Paul's mother is alive and well as there is no mention of any illness or distress regarding her. Thecla, a neighbor of Paul, also mentions seeing Paul and refers to him as her father. This implies that Paul's mother is present and in good health, as she is not mentioned separately during this encounter.