Hoping there is enough detail in photos to identify to species, there were three Wahlenbergia species seen, a larger one much more common, flower about 30mm across, and a tiny one, flower about 8mm across and this one the flower was about 15mm across.
The flower diameter is too small for W.planiflora. Even 30mm is cutting it fine, the first two are likely both W.multicaulis, with the larger one being possibly W.capillaris or W.luteola.