If its a  mathematical problem, the answer should be 10,990.

How?
Lets just look into 1 girl and her bag for now. If we get the right answer from 1 girl, rest is simply multiplying  by 7 for 7 girls.

So,

STEP1:  Girl has 2 legs = 2;
STEP2:Girl carries 7 bags with each bag containing 7 cats, so total cats she is carrying is 49.
            Since, each cats have 4 legs, so we have = (49*4);
STEP 3: Now lets calculate the Kittens.Each cat has 7 kittens. However, as calculated in step 2,
             there are 49 cats. So, 49 *7 will give us 343 kittens,
             and since each kitten has 4 legs =343*4= 1372;
STEP4:  add them up =   2+(49*4)+(49*7*4)
STEP5:Since there are 7 girls, final answer will be,
             7*(2+(49*4)+(49*7*4)) = 10,990.