Absolutely! I completely relate to the challenge and the guilt, but also the necessity of finding time for self-care as a mum.
One thing I do is keep an 'essentials' kit in my bathroom packed with quick treats - face masks, hair masks, nail polish, a book, lip balms etc. So when I have those rare stolen moments, they're already there waiting and feel like mini indulgences! I also keep a pair of comfy sneakers and workout gear in the trunk of my car so that if I get an unexpected free hour or can sneak out while Dad's on toddler duty, I can quickly hit the park for some exercise.
I also find that planning ahead for me-time helps - knowing that I've got some weekly activity lined up, whether it's a walk with a friend or a yoga class, gives me something to look forward to and stay motivated for.
And like you said, little mindfulness moments throughout the day are such a help too - even just closing your eyes and taking 3 deep breaths can make a difference!