Dry pavements wouldn't necessarily be any safer from distemper/parvo than grass. These can live for 6 months in very harsh conditions.
I don't think booties would make much realistic difference either unless
- you sterilise the booties to start with
- you carefully remove them with rubber glves, not allowing any part of the bootie to touch you or her or any item she can comein contact with
- you sterilise the booties fully again immediately (which will require a special cleaning agent)
- and store them in an environment that is safe til next use
The reality is that you are not that likely to come in contact with any of these things in the very short time you would put her on the grass/ground, let her relieve herself, and pick her back up -- I just wouldn't use a park frequented by dogs or an area of the street or a grass verge likely to have had visiting dogs.
FWIW there are breeders and trainers who also feel it is important not to totally isolate a pup during this puppy vax period anyway and take some calculated risk as if they are not thoroughly socialised and meet lots of 'safe' dogs in this period (not just people) you lose the most important windows for dog-gog socialising that help guarantee you won't end up with a poorly socialised problem dog. I know breeders who take pups during this vax period to dog shows for example --right or wrong -- but have never heard them having problems.
I would attend puppy classes and have play dates with vaxed older dogs all during this time to prevent such problems. If you read After You Get Your Puppy (the free book download linked to in many threads on puppies here! Or just google it) you will se the internationally regarded trainer Dr ian Dunbar positively insists on socialising pups widely well during this period. You are def getting her out and about which is great!