Hungary's Agnes Mutina took gold in 4:01.25 ahead of Spain's Melanie Costa Schmid (4:02.26) while another Hungarian Boglarka Kapas (4:03.42) was also ahead of Nocher.
The Wexford teenager broke her own Irish record by 16 seconds with 8:19.45 and came in behind Italy's Frederica Pelligrini and Hungary's Boglarka Kapas in Eindhoven.