I agree with the other moms-looks like a spider bite, as a bee sting will usually just be raised and red. If in case it is a bee sting, inspect the area and see if there is a stinger still sitting there-remove it using the edge of a credit card or knife, as if you use a tweezer, it will pump more venom in.
Clean the area in both cases with soap and warm water. Usually in other cases (bee sting,etc) you use ice to reduce redness, but if you suspect a spider bite, apply warm compress (towel dipped in hot water)-don't squeeze or press area. Neosporin cream helps to prevent further infection-apply somewhat thick on area,and cover with a semi permeable gauze or bandaid. The pack should be changed 3-4 times a day by washing area with warm water and reapplying, or till you see doctor and get further instructions. Also, don't use hydrogen peroxide or alcohol on area. If needed an oral antihistamine (like children's benadryl-may make daughter sleepy) can be used to reduce itching, and other effects of the sting.
Tylenol or Motrin can help with the pain..