Janssen's injury-time free-kick beat keeper Sophie Baggaley, but came back of the woodwork as Birmingham managed to cling on to a deserved point after a battling display at Boreham Wood.
Freda Ayisi and Remi Allen had gone close for the visitors either side of half-time, but a game of few clear-cut chances ended in stalemate to leave the Gunners five points adrift of leaders Manchester City.
Source : PA
Source: PA