yeah, peach actually does have a slight advantage against sheik. mostly because of her aerial priority, and it's hard to approach her with a nair or fair because you can be beaten.
a good technique could be to dash under her float and shield whatever aerial she hits you with (probably dair) and counter between the dairs with utilt.
needles are good against her, especially if she's glide tossing. however she can easily float above the needles.
your aerials aren't COMPLETELY shut out, you just have to hit her before or after she uses one. for example if you nair fast enough, you'll knock her out of her float. it's very risky but for bad matchups, you need to take those risks sometimes. sheik cannot work super well on the defensive, period.
space with bairs because peach will space with fairs. her priority will beat anything so you have to outrange her so that she wont be read to space a fair (unless she just uses it anyway, then hope your attacks will trade.)
overall i think you're better off using zelda in this matchup, however some zelda players say peach has a slight advantage on zelda too (i don't believe them.)
just make the best of whatever damage you can do, because there's not a lot of opportunities to beat peach's priority. you have to beat her between her moves with your superior speed. for example if she fairs your shield, shield grab IMMEDIATELY or jab counter, because you need to hit her before she jabs you.
random tip: if peach grab releases you, her jab comes out really fast so your best option is to jab right away
you need to MAXIMIZE damage, but don't get too greedy with combos. the best you can do is usually 2 ftilts to nair... or double jab to grab, grab attack, fthrow. just do as much damage as you can because her priority is too good for you to be greedy.
peach is all about the float spacing. if she doesn't have good float spacing, she's not that good a peach. block glide tosses and roll away, there's not much you can do to that approach. if you're really manly (like me) you can catch them and hit her at the same time with dash attack.
if she's really high up, you have nothing to lose in trying to follow her and uair. it'll beat her dair
recover with vanish usually and try to position yourself to not be hit by fair
when being edge guarded from the ledge, make sure you watch her closely and choose the best get up option. for example don't just ledge hop fair right away, you can be blocked and countered by peach's nair.
if peach is being defensive, walking up and spamming jab is too good
sometimes if she is floating, you can just run up and usmash (or dacus if you're really feeling manly) and sometimes it will tipper or double hit since she is usually right at the height of sheik's arms
if she floats up high, then go under her... crouch, block, or utilt
yeah.... very unorganized.... but random helpful tips for the peach matchup... LOL
this topic is about toon link... owned