No interactions present.
An indication of size would be useful for some of your photos. I don't know Slovenian flowers, but this looks like the smaller S. pusilla, as well.
In fact, I have just noticed that iSpot has suggested pusilla for the EoL link, so perhaps they are synonymous?!
My Flickr photos...
Sorry I failed to give the size .. By memory these (or similar looking plants which may have been different species!) were quite variable in height, from fairly low growing carpets - around 7 cms, to taller standing clumps maybe 10-12 cms, but I put this down to degree of wind exposure. The flowers were maybe around 8-10mm across. This Italian site http://luirig.altervista.org/flora/silene.htm lists S. alpestris and S.pusilla separately (the latter as a synonym for S.quadridentata). Both live at the altitude range I took my photos. S. alpestris is mentioned on several Slovenian flower sites and is listed on Triglav parks' flower list http://www.innvista.com/science/ecology/natpark/triglav.htm so may be the most likely, but S.quadridentata is down as a ?? on the list also, so maybe cannot be ruled out unless my size guesstimates help.
Nick Upton, naturalist and photographer.
Lat/Lng: 46.2465, 13.8401
Limestone mountain at around 1700m