Old Dog Having Bladder Incontinence

Hi all! I have a nearly 8 year old lab whose developing bladder weakness. We also have a dachshund with neurological issues who uses a puppy pad in the house. My lab was housebroken very well before I got her, and she refuses to use the bathroom inside willingly. I'm wondering if anyone has any advice on how I could train her to use the pad as well? One of us is home most days to take her out, but there's one day a week where we're gone all day, and I don't want her to be stressed out from having accidents. Any advice is appreciated!