I agree with everyone else that you should bite the bullet and just tell your mother since laser removal is not only a long, expensive and painful process but also often leaves enough evidence of your stupidity that she will still notice, as other people have already said.

Yes, your Ma will be disappointed since she already told you what she thought about the idea. You’ll probably have to live with her being less trusting than before for a while. She’ll get over it though.

What did you end up getting? I remember you wanted something done in dedication to your mother at some point and then reading about a koi.