A 25-year-old mother with opioid use disorder is in recovery with buprenorphine therapy. At her postpartum visit, she expresses fear of relapse due to social stressors and lack of support. Which nursing intervention best promotes long-term health?

Recommend immediate discontinuation of buprenorphine

Encourage her to "try harder to stay abstinent without external support

Focus only on infant milestones during the visit.

Refer her to a peer support group and coordinate follow-up with addiction services