I can also give you many accredited sites as to why you may want to wait. Everyone has a different view and mine is not incorrect or 'false'.

http://www.naiaonline.org/pdfs/longt...uterindogs.pdf

Yes, some cancers may lower because of spaying, but others increase.

Here are some reasons you may not want to spueter

• if done before 1 year of age, significantly increases the risk of osteosarcoma (bone cancer); this is a
common cancer in larger breeds with a poor prognosis
• increases the risk of splenic hemangiosarcoma by a factor of 2.2 and cardiac hemangiosarcoma by
a factor of >5; this is a common cancer and major cause of death in some breeds
• triples the risk of hypothyroidism
• increases the risk of obesity by a factor of 1.6-2, a common health problem in dogs with many
associated health problems
• causes urinary “spay incontinence” in 4-20% of female dogs
• increases the risk of persistent or recurring urinary tract infections by a factor of 3-4
• increases the risk of recessed vulva, vaginal dermatitis, and vaginitis, especially for female dogs
spayed before puberty
• doubles the small risk (<1%) of urinary tract tumors
• increases the risk of orthopedic disorders
• increases the risk of adverse reactions to vaccinations

While this is why it may benefit

positive side, spaying female dogs
• if done before 2.5 years of age, greatly reduces the risk of mammary tumors, the most common
malignant tumors in female dogs
• nearly eliminates the risk of pyometra, which otherwise would affect about 23% of intact female
dogs; pyometra kills about 1% of intact female dogs
• reduces the risk of perianal fistulas
• removes the very small risk (≤0.5%) from uterine, cervical, and ovarian tumors

http://www.caninesports.com/SpayNeuter.html

This is from a lab breeder's website, written by a veterinarian
http://www.littleriverlabs.com/neuter.htm

You will find information for both sides if you look anywhere... to each their own. I'm just telling her from my point of view, nothing is terribly wrong in this situation. Maybe it is to you.