On floor 2, you may have noticed this little can of gasoline in the shop that costs 25$. You need to get this before moving on, as it is what trigger's the fight. Many people think it is required to get Moko (which is fair), but it actually isn't. So be sure to grab this before you leave.

Once you reach floor 3, you may notice this little question mark as shown as one of the rooms. This is where you will fight Shred, so be prepared.

I don't got images so ill just describe her attacks. Overall, she is very similar to the first boss, Magnolia, just a little bit harder.
Dash - she dashes at you like Magnolia, shrimple as that.
3 slashes - she slashes three times one after the other.
Jumping slash - Magnolia attack :P
Uzi - shoots a few uzi shots

At the beginning of the fight, I've noticed that she most often starts with in this order or at least similar to it.
Dash -> 3 slashes -> Uzi shots -> jumping slash

tips for the fight

• Since she always uses dash first, which has a very short wind-up, I'd suggest jumping or dashing at the beginning of the fight
  
• The 3 slashes attack has a bit more range than it lets on, so be a fair distance away.
  
• When dodging the uzi shots, I'd suggest jumping and using melee (assuming you're using Disc) to air stall and get over it because most of the time I end up dashing into Shed and taking damage anyways :v
  
• Personally, using melee attacks is a bit risky as most of her attacks have very short wind-up and little end-lag
  
• After she uses Uzi shots, her next attack is most likely either the jumping one or dash, which can both easily be dodged through
  
• getting a cake and damage boost on the first floor is recommended, but not necessary (duh)
  
• it isnt bad mate, just give it a few tries and you'll have yourself a fine character

im prolly gonna forget to add something the moment i post this, so i might say stuff in comments if i feel like it :v
also feel free to add you're own advice if I missed something