Non-PRO Greek to English Other Idioms / Maxims / Sayings

Karamitros – the programme manager – has sacked Maria and nobody at work will speak to her, including Nasos, who she was just beginning to fall for. It was she who had stolen the silver picture frame.
She is reflecting to herself:-
If all this hadn’t happened…..και σιγά το σοβαρό πράγμα, δηλαδή [? call this a serious matter in other words. i.e. big deal?].
Maria tries to make an appointment with the boss of the whole outfit to explain but he’s abroad and unreachable. He loathes mobiles and only his wife has the phone number of his hotel. She – Mrs Dedes – is coming to the office tomorrow morning and his secretary asks Maria if she wants to see her.
Τι να την κάνει την Δέδε, she only gets on well with men.
Nasos eventually goes round to Maria’s house, which he has been to once before and where he recognised the stolen picture frame. He tells her he informed on her and told Karamitros everything. Πως δεν [it’s lucky that?] κατάλαβε αμέσως ότι μάνθανε για την κορνίζα από το Νάσο; With all that had happened she forgets he was here with her the previous evening. Και πως να μην ξεχάσει; [? and it was impossible for her not to have forgotten] Μήπως κάνανε και τίποτα; [Did the by any chance get up to something?] They ate an omelette and it was burnt.