When I type "laurel700" in the search box I can then click on "go to @laurel700" and end up on Laura's account.
If I type "laurel700" and then the enter key I get one highlight and one recent post where "@laurel700" is mentioned.
If I type "@laurel700" and then the enter key I get no result.
My guess is it's just the strange way Twitter is set up.
There is still the possibility that something is hidden for some and not for others.
If I do the bolded part above, I get to Laura. I wouldn't have thought about that though, and it took me a while to understand what you mean. It definitively wasn't like that before. As mentioned before, Laura used to show up right in the search box as soon as I click on it with profile picture and account (which is normal in that way I guess, since I look her post up frequently). But now her account doesn't even show up anymore (with profile picture and account) when if I type her exact twitter handle in the search bar. Now it only works with the detour via the "go to @Laurel700" trick.
Now when I type "laurel700" in the search box and then the enter key I see Laura's account listed. It just changed...
When that sort of thing happens I suggest to try to type an account name listed in the suggestion list. The result should indicate if this is a general issue or some sort of shadow banning.
What browser are you using? I use the Yandex Browser.