Yeah, anxiety increases heart rate not lowers it. Her heart rate while living there looked to be around 50bpm in the charts, which is apparently "low" -- not just for her personally, but medically low.
High heart rate: https://www.medicalnewstoday.com/articles/175241#causes (anxiety)
Low heart rate: https://health.clevelandclinic.org/is-a-slow-heart-rate-good... (nothing psychological)