Best way is to go to the church shop and buy lots of blank papers and pens. Paper costs 1 dollar each and pen 3 dollars each. Once you buy those, go to your laptop in your room and select the craft item option. There you will be able to craft a handmade drawing of your mom. Gift her those in the evening, since each of them gets you 4 or 5 love points with her.
To level up lust, first gain 25 love points with her. Once you do that, handjob option will be available in petting categorie of her interaction menu. While she gives you a handjob, select the dirty talk option on the animation menu, and then keep selecting the romantic talk option, since it is the one she likes the most. the first and third options give you no lust, and the fourth angers her.
All of her caps in this build are at 25 points. So should be pretty easy to see all of her content.