Please treat yourself with more kindness than this. My weight can fluctuate by 4lb within a day, it doesn't mean anything.
If you are only limiting your food and drink intake, you may well have reached a plateau. Your age and hormones might be making it much harder than it would have been to lose weight a decade or so ago.
This sounds like a weekend where you should have enjoyed your DD's company but you've ended up making it about your own disappointment in yourself and that's not a mentally good place to be. I've been there! It is shit! Do not recommend it at all.
I put a dampner on so many holidays and events years ago by being mean to myself and feeling immense disappointment in how little weight I lost before the event or trip. I look back on those photos and I was gorgeous! I was a glowing, healthy size 10. But I was miserable inside. I thought my arms were too fat for my wedding. My lovely wedding to my lovely DH with all our friends and family and I was just thinking about my massive blobby ham arms which were the arms of a 20 something size 10. FFS.
My friends and family and colleagues don't value me for the size of my waist or the weight of my body. And it's the same for you. Please don't wrap your whole worth up in your weight.
Four pounds is hardly anything. It's a big poo and a good night's sleep.
If you are actively trying to continue losing more weight I can't stop you but I can tell you that one weekend cannot sabotage the whole weightloss journey. It's happened, now get back to the misery of weighing your pasta and logging your food and drinks. Guilt around food makes me mad. I've been there in a restaurant or pub crying because nothing on the menu works for me because I want the delicious thing and not the sad little salad or soup and oh my days, what a stressful horrible experience those years were for my mental wellbeing.
Are you also moving in ways that you enjoy? Dance classes? Long walks? Whatever it is. That's about ADDING something to your life - fresh air and new skills, going swimming with friends, doing a sponsored jog with family. Food wise too - rather than solely concentrating on less and fewer, ADD more vegetables to your plate, focus on nourishing your body, fuelling it for activity, not on just making it smaller.