I think it is a great idea to learn how to crochet and to know how to do both, even if all you ever learn is just the basics. There are several knit patterns that ask you to crochet around the edge, so I think it is an important skill. When I first learned to crochet, I couldn’t imagine that I would ever want to learn to knit, but have come to realize that there are some things that each method works best for.
Crochet is really good for blankets/afghans, dishcloths, toys, and bulky sweaters, but knitting is really the method of choice for wearables to get the drape and show of the quality of yarn. There are somethings that I just automatically go instantly to my crochet hooks for and other things I go for the sticks.
I actually knew how to crochet before I learned to knit and knitting is easier in the respect that there are only 2 basic stitches. In crochet there are at least 5 stitches you will need to learn, and there are many variations of those stitches. The thing that I have seen most knitters, learning to crochet, have problems with, is finding the most comfortable (ergonomic) way to hold the hook. Also if you are a thrower rather than a picker you may find wrapping the yarn for tension on your hand will take some getting used to. BUT IT IS DOABLE. Don’t give up if you have problems learning from your mom, try taking a class at LYS or ask a fellow knitter to share her method. Each person needs to find the way that is most comfortable for them to find success and not every teacher is capable of teaching multiple methods, so if one teacher doesn’t work, try to find another. Just like clothes, one size doesn’t fit all, and you just have to keep trying one different sizes till you find the one that fits.