I've been working in a tiny print studio for the last two years, there's only three of us, the boss, myself and another coworker. I've worked three or four days a week from the start depending on how busy it is, I freelance as a graphic designer the other days of the week.
It's a pretty unconventional work place, there isn't really any boss/employee dynamic and we see each other outside of work as well, it's always felt more like friends working together. It's only a part time job but it's such a big part of my life I moved back in with my parents to be closer to the studio.
I like to think I'm a good employee, able to come in at a moments notice, working even when my dad was in the hospital, staying until 9 or 10 at night sometimes and working a lot of unpaid hours to help out my coworker when it was busy. I've been doing graphic designs jobs for my boss for the last year or so as well, I only get paid a little more than minimum wage which is about a tenth of what I charge my other clients but I've never really minded since I enjoyed working there.
Long story short, my boss was away for a couple months on annual leave so I was working in the studio by myself. My sister has a tiny Etsy shop where she sells homemade earrings, she couldn't afford business cards and begged me to print off a few at the studio. I designed them at home and printed them in my own time using scrap card. In hindsight I definitely should've asked my boss first, that's completely on me, but it was a 10 minute job and she'd always allowed me to print personal things before. She was also on a boat at the time with spotty reception.
Fast forward to today, she's been acting weird for the last month or so, being really stand offish and straight up ignoring me at times. I didn't think much of it, assumed she was going through something personal. She asks me to come into work early, I do and she greets me like normal, asks how my weekend was etc., then she asks if she can look at my keys so I give them to her. She comes back and that's when she tells me she knows i've printed those business cards. I had no idea what she was talking about, I'd forgotten all about them, but then she confronts me with the 'evidence'. A print list that said a file had been printed that she didn't recognise, she had also ordered a pair of my sisters earrings under a presumably false name to compare the card stock of the business card that came with them with the card we have in the studio. She took my keys to the studio and said I wouldn't be getting a reference because I'd stolen from her.
I'm assuming this means I'm fired but I've had zero notice, I know what I did was wrong and I apologised profusely but I don't know what to do next, do I ask for my P45? I'm hesitant to contact her since the whole situation has shaken me quite badly. Any advice would be very much appreciated.