Just wait and see what she is hired to do.
On-site coordination for a reception is primarily concerned with preparation; receiving vendors and supplies like linens, flowers, centerpieces, favors, place cards, cakes, liquor, decor, etc. and seeing that the space is properly prepared and assembled. Most of what she does will be done before you even arrive.
She may or may not be hired to actually Captain or direct the festivities. Often, they will do little more than liason between all of you to see that you're still okay with and all on the same timeline.
On-site coordination for a reception is primarily concerned with preparation; receiving vendors and supplies like linens, flowers, centerpieces, favors, place cards, cakes, liquor, decor, etc. and seeing that the space is properly prepared and assembled. Most of what she does will be done before you even arrive.
She may or may not be hired to actually Captain or direct the festivities. Often, they will do little more than liason between all of you to see that you're still okay with and all on the same timeline.