Bus from Santiago to Sarria

Hey guys. I am starting my walk in St.Jean le Pied port this Friday the 18th. I have to be in Sarria by the 5th of September as my mother is flying in to do the last 100k with me. I plan on cycling the Messeta and maybe a bit more so that I can get to Sarria by the 5th.

Anyway, my question is..... Do you know if my mother can get from Santiago to Sarria on the 5th by bus? I am sure she can and normally I would just arrive in ST and go to the bus terminal. My mother likes to be a bit more organised so here I am asking the question. I have looked online and I have gone to the volunteers office in Dublin but I still don't have a clear answer. I am hoping that you fine pilgrims can help me.

Much appreciated,
Andrea and Lucy

Ah Gerard,

You're a star.
Thank you so much. You have made my life so much easier.
My mother would have been in a total panic.

I am a Dub but not a follower over the GAA so I'll put a few positive thoughts to Kerry getting Sam while on the Camino.

Once again, thank you.