Where's the Next Throw-In?

[mj]

Team A inbounding from their frontcourt along the sideline. Throw-in goes into the back court and is first touched by A1 when she has a foot on the endline. Where is Team B's next throw-in from? Is it from the previous spot because Team A did not touch it inbounds? Or is it from the location where A1 touched it while she was out of bounds?

Thank you.
MJ

PS Be gentle on me it's my first post here.