Yo, be careful about the info you give out. I am a Samus main, so I'm gonna correct you on a few things here.
Samus' spaced ftilts and utilts are safe on shield. To punish ftilt, you have to force a misspace or get around it. As for utilt, you can punish the startup.
I'm assuming you didn't read the part where I said close ranged. Almost any spaced move in game is really difficult to punish or impossible. Spacing is key. I said to get close to Samus. Once she hits your shield, it's over if she isn't spaced.
Regarding Utilt startup I wouldn't recommend punishing start up lag, it's better to wait it out first. Only if you really guess the Utilt.
No, don't just let her go. When Samus is on the edge, Sheik has an extremely large advantage. Samus's ledge options are pretty bad. Jumping straight from the ledge is probably her worst, followed by rolling on. Her best options are usually ledgehop>fair/nair/uair and ledgehop>WL>shield/dsmash/etc. Position yourself and punish accordingly.
I agree with you but maybe I've should of clarified.
Instead of just continually attacking Samus while she's on edge just wait her out. She has options and mixups on edge. I play against a high level Samus a lot. She may have few options against sheik but that doesn't stop her from mixing up what she does.
Be close but not too close.
Pretty linear, huh? Next thing you know, you're gonna say that Samuses never grab, right? Block/spot dodge>grab won't do anything against Samus's truly safe moves, a.k.a. ftilt and utilt, and if you've truly been conditioned to shield everything than Samus WILL grab as a mixup. (-_-)
You assume I don't know about grab mixups? Instead of assuming what I am going to say, maybe you should think of my experience against her. I am very aware of Samus' grab mixups and I have constantly been exposed to then.
Her 'safe' moves are very punishable if you aren't getting punished then everyone you're playing is playing the match up wrong. Wait, not even. If someone is trying to punish your spaced moves, then that's just a failure on their part.
Example: Sheik's F-tilt spaced is safe regarding certain characters, however her safety is compromised when it's mis-spaced.
The match-up is simple: Force a mispace-> Grab-> Fair is all you really have to do. If you can at later percents or if you are confident you can link Fairs into more Fairs till death. Even a truly spaced Fair on a CC samus is safe.
There is a reason Samus isn't higher on the tier's list. Her moves aren't safe they are laggy.
A quote from our very own KirbyKaze :
What is overrated about Samus?
Quote from Stevo: The reality of Samus' tilt
M2K vs Hugs
Look how often M2K is running up and shielding and look at 4:10 to see M2K punish a decently spaced F-tilt.