Albert Barnes on Luke 13:11

There was a woman which lead a spirit of infirmity. Was infirm, or was weak and afflicted. This was produced by Satan, Lk 13:16.

Eighteen years. This affliction had continued a long time. This shows that the miracle was real; that the disease was not feigned. Though thus afflicted, yet it seems she was regular in attending the worship of God in the synagogue. There in the sanctuary, is the place where the afflicted find consolation; and there it was that the Saviour met her and restored her to health. It is in the sanctuary and on the Sabbath, also, that he commonly meets his people, and gives them the joys of his salvation.

(i) "spirit of infirmity" Ps 6:2