Thank you for your question.
Sorry to hear you aren’t getting the sufficient pads your wife needs. She would be more protected with an all in one pad, which are nappy style pads with fixation tabs or a belt. They are a bit bigger, however will provide the absorption she needs and allow less product changes.
I would recommend the TENA Flex Maxi, which are belted all in ones.
You can also try a sample pack of heavy products to find which product is right for her and give her a trial run.
I hope this is helpful, would you be willing to try this?
I am incontinent and I only get two comfort extra shaped pads for daytime use and one tena slip maxi for night time but it is better than nothing. I buy other pads and slips from ebay suppliers.