I'm a lard girl and have been for years. I get my lard at Winco, Walmart or Fred Meyer and have never had an odor problem so far. I just made soap with my daughter and the oils/lard had to be at least 9 months old, kept on a bottom shelf with my other oils and there wasn't a smell that I could detect. I'm the one in the house that everyone brings their question, "Smell this Mom, is it okay?" Never have figured out if they don't trust their own noses or they think I have a stronger stomach for rancid smells! LOL
I don't use a scent for the men of the family and none have come back with a scent problem with the soaps. Their soap is 80% lard and 20% CO. For the female side of the family I use 50% lard, 30% RBO 10% butter (whatever I have on hand) 5% castor oil and 5%CO. This one gets a scent and rice flour, and maybe rice sludge if I have it on hand. Again no piggy smells in any of my soaps.
Both get 2% SF to cut the soap scum. I usually melt the butters and sometimes the CO but rarely the lard and use the method of adding lye water while it's hot to melt the lard. No stearic acid spots that I can see but I'm not into fancy soaps and after I ran out of the colors that I used to us I just didn't bother with them either.
My daughter in Hawaii did say that she got one batch of soap that sort of smelled piggy, but it had also sat on her shelf for quite a while...And that probably means it was also in a plastic bag or jumbled in a box with who knows what. It could also mean that the humidity there is a factor...there is rarely humidity in our high desert conditions here.
Unfortunately you will not know if it bothers your Mother until you make it. Each of us are different in skin type and definitely nose types. It is good when starting out, to make small batches to test the waters so to speak. In both my soaps I allow 6 weeks for curing at a minimum and once I found the recipes that I liked I made soap often enough that I could cure for a year...and that soap had a really lovely creamy lather and was so mild on my old skin I have tried to keep up with that cure for all us ladies in the family.