I have met Laurel Harris at a UDC event. She seemed like a nice person. I do know other people that are friends with her and I believe they would vouch for her.
This is not the best forum to inquire about anything concerning European Dobermans as the list mavens here are not
really that knowledgeable of them, so are mostly negative concerning them and will steer you toward an American Doberman because that is what they are comfortable with. There are good, bad, and mediocre dogs and breeders in both the European and American camps. I do agree with their advice that you need to do your homework whomever you get your puppy from.
Also, as MC said Narcotics, SAR and ED is no stroll in the bark, that their dogs are certified (and not just training towards it) is imo very much a real working title and not an 'entry level' one. And while her dogs don't necessarily have any Sch/IPO/IGP levels and therefore the bitework is not 'certified' having the BH in conjunction with the WAC at least shows the instincts are there as well as the mind, temperament for the work and the work ethic (though I'd want to see the WAE's scoresheet). Bitework can be evaluated firsthand in a video or in person, so I wouldn't automatically rule them out especially if their focus is more on ED/Narcotics/SAR type work.
Another thing people might not realise - in my experience it is more common for working breeders to breed before titling, while the dogs are still young, rather than have to interrupt a bitch's career later on. Rebholzer has produced several generations of Sch/IPO titled dogs yet the breeder told me she doesn't ever recall any of her dogs being titled before breeding. Vom Koby Haus put a BH for the first time on their 10 year old bitch this year thereby earning her a BH and a UDC Ch title - and she's had three litters in the past. As they've both remarked "I've never had a puppy on the ground suddenly change once their parents earn a new title."
Another thing is working sport titles don't always tell the whole story (and I hear this as much from GSD people too!) You're better off seeing the dog work in person or get video, and like what you see on an untitled dog then get a titled dog but dislike what you see in how they're working.
(and also... were those titles earned on their home field with their usual helper in perfect conditions? Or were those titles earned at a strange field, during a championship on a hard helper in difficult conditions?)
It's a fairly different picture from conformation showing imo.
Without getting into the european specifics, I know people don't seem to value UKC and UDC Chs on this forum, but they still take work to achieve, still need to have 3 different judges and the UDC Ch requires a working or performance title, and requires a temperament test (including a 'protection' defence of handler portion like the WAE) to even be elligible to win a confo class. Also the UDC confo classes actually include a scoresheet and judge's ratings/comments so you get valid insight into what your dog's faults and qualities are. And often times they can be AKC judges!
I will reitirate however you've gotten some good advice: as with anyone do your homework on any interested breeder. Ask for proof of health testing. Talk pedigree with them (temperament, working ability, confo and health) and cross-reference if need be. Dobebug is correct that health results can be emailed or even sent via photo by text messaging. I know some breeders will also make photocopies to send home with the puppies for the buyer's reference.
Do you know the registered names of the parents she used? I've looked at the 4 dogs she has listed on her site in my favourite database for health info, one of them hasn't been added to the database, the others seem fairly old and overall the longevity isn't great for the most part (or they'll have great longevity on one side then the other side is quite bad. Just something to consider if you're comfortable or not with.