The Sion Swifts midfielder has been replaced Galway WFC's Aoife Thompson for the matches against Lithuania, Faroe Islands and Ukraine.
"Amy came into camp carrying an injury. She had a fitness test before we travelled to Lithuania. It's very disappointing that she wasn't able to travel", Ireland WU19 Head Coach Dave Connell revealed on Monday morning.
Despite the loss of Boyle Carr, Connell has said the preparations have gone well and that the team "are looking very sharp" ahead of the Lithuania tie.
Ireland WU19s go into Group 8 as top seeds, with hosts Lithuania the lowest-seeded team in the four-team group. Despite that, Connell isn't taking anything for granted.
"The first game is always tricky, but it's more testing that we're playing Lithuania on their own patch. All we're looking for tomorrow is a good performance and a win.
"Lithuania hosted the Under-17s Finals earlier this year. They have the experience of that and it's more or less the same side that played in that tournament.
"We have an experienced squad, with some players playing for the senior team. There is a good buzz around the squad. Everyone is looking forward to tomorrow's match."
Republic of Ireland WU19 Squad
Goalkeepers: Erica Turner (UCD Waves), Rachel Kelly (Shelbourne LFC).
Defenders: Tiegan Ruddy (CCSU Blue Devils), Aoife Slattery (Wexford Youths), Sadhbh Doyle (Galway Women's), Roisin McGovern (UCD Waves), Leah Brady (Galway Women's), Doireann Fahey (Wexford Youths), Rachel Baynes (Galway Women's).
Midfielders: Megan Mackey (Brighton and Hove Albion), Lucia Lobato (Galway Women's), Heather Payne (Peamount United), Chloe Singleton (Galway Women's), Isibeal Atkinson (Shelbourne), Sinead Donavan (Galway Women's), Ciara Fowler (Bankstown City Lions, Sydney) Aoife Thompson (Galway Women's).
Forwards: Carla McManus (Kilkenny United), Louise Masterson (Peamount United), Alannah McEvoy (Shelbourne).
Fixtures - Qualifying Round, Group Eight
02/10 - Republic of Ireland v Lithuania, SRC Alytus, Alytus - 4pm
05/10 - Republic of Ireland v Faroe Islands, Marijampole Stadium, Marijampole - 1pm
08/10 - Ukraine v Republic of Ireland, Marijampole Stadium, Marijampole - 2pm