degrassichick1- Yeah I know Ellie used to hang out with Marco all the time but now she really doesn't. I Liked their friendship too but we never see much of it anymore it seemed like ever sense Ellie was going out with Sean we havn't seen her with any of her friend's that much.

Which would be fine, except that's not what happened at all.

Ellie/Marco S3 scenes before TOM:
Pride -- Ellie's tired of pretending.
WTAS -- "Oh, dio mio."

Ellie/Marco scenes between TOM and BIB:
DDIO -- She even takes Marco on a date with Sean. They also talk about Terri.
IRM -- She modeled for the Bollywood poster.
KOP -- Sean and Ellie back Marco. Not Alex. Marco.
AILMH -- "So, you naked?"

Ellie/Marco S4 scenes after BIB:
QOH -- Marco introduces Ellie to gambling.
MD -- Ellie calls Dylan a colossal jerk.

Ellie/Ashley S3 scenes before TOM:
AAO -- They visit Montréal; Craig sees Manny again.
AWH -- Ashley and Manny hate Craig. Ashley also hates Manny. Ellie hates Manny too for some reason.

Ellie/Ashley scenes between TOM and BIB:
RRHS -- They get revenge on Craig. I still think Ashley should've asked Ellie to have Sean steal Craig's guitar.
AILMH -- "And how's Sean?"

Ellie/Ashley S4 scenes after BIB:
ND -- Ellie tells Ashley her relationship with Craig will Crash.
Secret -- Ellie tries to help Crash out. Doesn't work.
Or maybe you mean because Sean and Ellie disagreed with Marco in MS. Because they weren't psycho freaks.

Marco and Ellie were also sitting together in the beginning of father figure. Ashley and Ellie also walked to school together and sat with each other at lunch in WTAS that I didn't see on your list.

But in season2, even though Ellie wasn't a major character everytime she was onscreen she was pretty much shown with Marco or Ashley. That's when she was single.