You can yes.
I say this with kindness though as I know your mother's history, it will not do her any good. It won't extend her life. She will have every other treatment available to her in the meantime, she just won't be for resuscitation.
She has an aortic aneurysm and I know you know this but it means this can go at any time and there will be nothing anyone can do. Pumping on her chest, breaking her ribs, stabbing needles into her, will be futile. It will just be traumatic for all involved, especially you if you have to witness it.
Sometimes it is taken out of your hands anyway and you won't have a choice. The resus council state that clinicians can make the decision not to do advanced life support if it is futile, and in your mother's situation it would be.
I know you're going through such a hard time right now and I know you must be terrified of losing her. Here with you and thinking of you 