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Everything that you used to clean up the smell, unfortunately locked in the smell. Take a juicy lemon and rub into the area and then clean with a damp white rag. Allow to dry, if this doesnt work you could clean the area with a mixture of vinegar and water. Milk is an acid based stain and must be treated with an acid based cleaner.

Hope this helps…Good Luck !
Carpets/Upholstery:
1) A great non-toxic carpet stain remover is club soda. Soak spot immediately with soda and blot until the stain is gone.
2) Pet Urine on Carpets: Dab area with toweling to absorb as much as possible, wash spot with liquid dish detergent, and rinse with 1/2 cup vinegar diluted in 1 qt warm water. Lay towels or paper towels over the spot and weight down to absorb excess moisture. Let stand 4 to 6 hours, then remove toweling, brush up nap and allow to dry completely. Use an electric fan to speed drying.
3) Red wine stains can be removed from carpet by rubbing baking soda in and vacuuming.
4) Sprinkle cornstarch onto carpet, vacuum.
5) To remove grease spots from carpets, first sop up the liquid with a sponge, then rub a liberal amount of baking soda into the spot. Let it absorb overnight. Next day, remove the excess and vacuum the area.
6) To remove grease spots from carpets, first absorb excess with a sponge, then rub a liberal amount of corn starch into the spot. Let sit overnight, then vacuum.
7) Dry cornstarch sprinkled on rug and vacuumed.
Carpet Fresher
4 cups baking soda or cornstarch
35 drops Eucalyptus essential oil
30 drops Lavender essential oil
25 drops Rosewood essential oil
or any combination of your favorite essentail oils
Measure 4 cups of baking soda into a bowl, add essential oils. Break up any clumps that form, stir until well mixed. Before vacuuming sprinkle powder from a shaker type can or jar. Let it sit on the carpet for about 15 minutes then vacuum.
9) Herbal Carpet Freshener
1 cup baking soda, 1/2 cup lavender flowers
Crush the lavender flowers to release their scent. Mix well with baking soda and sprinkle liberally on carpets. Vacuum after 30 minutes.
10) Sprinkle baking soda on carpets before vacuuming for a natural rug deodorizer

if she poured that much milk on the rug, then the only option is to remove the carpet, no cleaning agents will clean the bacterial growth that has been festering in the carpet. If it was a small spill, and it was caught right away ( like 4 oz or less) the liquid could be sucked up (or toweled up) and then a good cleaning with 50-50 tide water soultion scrubbed into to the fibres & pad could handle the problem, but the smell will only get worse & the bacteria & mold that is growing in & under the carpet is a health hazard for you & your family. If new capeting is not an option for you right now, you might want to consider pulling up the old carpeting scrubbing the spot where the milk was and painting the floor ( if it is not hardwood) if it is hardwood, you could consider refinishing it. That orange glo hardwood floor refinisher is GREAT, and not too expensive. My 3 yr old popped off the top of his sippy cup and spilled that on the carpet.I was able to clean it with several applications of tide- water solution, it was less than 4 oz of milk & it took two months of daily scrubbing to remove the smell. I also left baking soda on the stain over night each night to absorb the odor, but with a gallon of milk, there really is no other option than removing the carpet.

try oil and soap
you will then need to add salt to remove the oil
if that doesnt work trying burning the carpet

my fav. cleaning product is ammonia. get the lemon scented kind. works for everything. even in the washing machine!! gets your clothes and your house clean.
p.s. gary is way wrong… milk is ACIDIC, and therefore needs to be balanced by something more BASIC… LIKE AMMONIA!!! and its lemony fresh scent helps to mask odor as well. lol