Legit breeders do not meet in carparks to lead you to mystery addresses.
They do not ask for deposits before seeing litters, or exchange puppies for cash in carparks or give excuses that you can't see puppies Mum because shes staying with a friend/gone for a walk/having a week in Marbs.
Very few legit breeders advertise on epupz/pets4homes/etc - they use the breed club website and breed clubs puppy co-ordinator to let people know they have or are planning a litter.
It sounds like this breeder has ghosted you possibly because they've sold the puppy you were interested in or have failed to source the right puppy to pretend to have bred it... or various other nefarious reasons.
Get a friend to ring the number and pose as a puppy buyer - see if she answers when it is another number!
There may be a legit reason, I was once 'ghosted' by a breeder I was due to visit a few days later. Turned out she had dropped dead of an aneurysm leaving a not very doggy husband to deal with a litter of giant breed puppies and he was not in any sort of state to sort it all out at all!
Getting someone else to call will show if shes being shifty quickly enough, if she answers a different number and tells a potential buyer there still are puppies or indeed that they're all gone, but shes still ghosting you... that answers that!
Two places I'd look for puppies.
Kennel Club Website will give you the details for the breeds Breed Clubs/Societies. THey will have a puppy co-ordinator or the secretary will have a litters/puppies list.
Champdogs have a decent listing system for breeders who KC reg, health test etc etc.