I suggest you don't worry about candles or incense. Demons are very understanding they aren't going to attack you for it not being perfect.
Many summon demons with sleight of hand(empty handed). As long as you perform the right steps the props aren't necessary.
That isn't to say they don't appreciate the props but if you have issues with it and it causes situations with your religious tenets don't risk the situation by having props just avoid them till you are able to be on your own IF you wish to use props.
BTW might I make a suggest. Consider summoning Valefor(Green-Nordic hybrid Demon) for your mother if you wish to help her out. Seems like you have a consideration for her and she means something in your life.
I don't know why but out of all the healing demons for some reason Valefor sticks out the most. Not to disrespect the other healing Demons but Valefor is a wonderful entity and others have stated such that he sticks out for them and they summoned him, consider reading some other members posts on such help for healing or finding scenarios that healed them.