Hi and WELCOME to YT
! So glad you came out of hiding to post! And of course you're welcome even though this kiddo isn't fully yorkie
. All are welcome here!
Some of what you're hearing is true, but a lot of it is not, so try not to let the bad stuff get to you too much. Hypoglycemia is indeed common to yorkie pups, but they do tend to grow out of this as they grow out of puppyhood.
With the wee ones, there are always general safety concerns like heights, being underfoot, falls etcetera - but all of those can be mitigated (have her wear a bell, get doggy stairs...) and you'll just have to be more careful w/ her in general bc of a vulnerable size.
But as far as organs not developing - that's just not the case AT ALL unless there is something actually wrong her physiologically / developmentally / genetically - and size does not determine that.
That said, yorkies *are* prone to hypoglycemia, LP (luxating patellas), liver shunt and a few other things. You'd want a vet to thoroughly check her knees...and even if they feel fine now, there could be problems later - BUT as long as they feel fine now - I'd get Pet Insurance ASAP bc if something goes wrong later, you'd be covered! I'd get a full blood panel on her to assess liver/kidney function especially...liver shunt can be a very tough reality in these very small ones...so def check for that bc that's a big deal and very expensive.
I have 3 yorkies, btw, and my biggest one is about 8 lbs - and he has FAR more health issues than my 2 smaller ones, who are around 4 pounds. So, size doesn't discriminate or determine (on its own) issues.
Best of luck w/ your decision - just know that as long as she has good general health - you can do this! But I'll stress again - get health insurance on her right away, before she develops any pre-existing conditions. I have Healthy Paws Insurance and think they're great!