What is the suffix らっしせる?


A Japanese friend, a woman in her seventies who comes from Sapporo and has
long resided in Tokyo, and who does not speak in a strong Hokkaido dialect,
writes several times in a letter to me the -て form of a verb followed by
らっしせる. I've never seen this before. Examples in her letter: 近づけてらっしせる and
出かけてらっしせる. Is this some unusual form of the auxiliary or suffix adjective らしい,
which means "like" or "appearing" or "seeming"? Thank you!

