Why does my Phal have all the flowers wilted and none dropped? :-/

[Shikitita]

Hi there!

After all the different posts I've written and the help I've received from a few of you, I've decided to write another one as I am not sure what seriously is going on with one of my orchids.

I have had this Phal (pictures at the end) since April 9th, and has had all the flowers on display since mid May. About 3 or 4 weeks ago (when the heat wave came here), the flowers started to wilt and now they are all of them as you can see in one of the pictures. I water her every once a week, the roots seem all to be healthy enough (the ones inside the pot at least) and also the leaves, but hasn't grown any new leaf yet and the flowers, despite their aspect, haven't droppred at all, not even one of them.

Is it normal what's happening to my orchid? Should I water her a bit more often? All of them have pebbles inside their ceramic/glass pots with a bit of water to keep them humid, but it doesn't touch the pots or reach the medium at all.

Is my orchid just too stressed and doesn't know if focusing on the flowers, leaves or roots? Help!

Thank you very much to all of you!