You're very welcome. I have a helpful idea for finger poking, too. First I hang the arm I'll be testing on down for about five minutes then I make a little mini tourniquet on the finger I will be testing. I use the rubber bands that come on broccoli in the store for this. Only leave them in place for about 10 to 15 seconds. Once you do the poke, undo the rubber band and the blood should flow very well.
Also, it's difficult to get blood out if I haven't been drinking enough liquids so advise mom to drink lots of water just previous to her testing.