No woory about questions, feel free.
Not much can say though about whay your mom might say, as dont have much/any background.
But as you say she knows about the issues, if you need some diapers/pads/pullups that is the best adult thing you can do to help keep things from getting ruined and/or help with the issues when there is a leak or alike.
Basically if you mom know your having issues, and you have an appointments, if she was to find out you got some samples and/or ordered some IC supplies to help with your IC i really cant think she would say much of anything and in fact would more than likely ask if you need any help with the costs or alike.
parents are VERY attuned to help thier kids for the most part (Yes there are exceptions) and usually as they are older are more likely to help out with things than anything else you think they might do, I've raised kids and no matter what if they need something i really wouldnt even take a second to help them in whatever way I can, or even any way I cant, have and will go without for them as well without a single regret in that.
But, you try out the stuff you got and see what works the best, I suggest that you use a tape on diaper for nightttime that just works the best, yes it's not a fashion statement, but neither is a wet bed, and having something thin that doesnt work as close as you can to 100% isnt work it. A megamax as example works very well, and to say go for a pullup doesnt work as well, it is not really less noticed in bed(as not that big a deal to hide anything under the covers), and the "advantage" of a pullup are sorta moot when it comes to 8 hours or so in bed and NOT at least wetting some, at least for me.
But, if you have questions, please post them and you will get answers, that is one the major things the site it very good at doing.