What do いっぱいいっぱい and 余裕 mean in this context?


I'm translating this manga, but I'm having a hard time because I don't know
what's the best way to translate these words

Context: see pics... sorry that there are 7 pics, but I felt that explaining
everything going on in there would be too hard and confusing. いっぱいいっぱい appears
on page 3 and 6. Basically, I'm not sure if it's meant to have a positive or
negative meaning in this context. I know that it's always used to talk about
something negative. And 余裕, I understood it as having the mind at ease so I
translated as laid-back, but I don't know if it's correct.

NOTE: before reading, I want to state that this is a romance story and Yuu has
feelings for her senpai, but she's in denial/tsundere for many reasons.

In this conversation, Natsuki (short black hair) and Yuu are talking about
senpai and Yuu's attitude regarding said senpai. Yuu is complaining about her
senpai, and Natsuki laughs because it's the first time Yuu complains about
something and says Yuu is いっぱいいっぱい. Then Natsuki talks about how Yuu used to
be/have 余裕(laid-back?) all the time, and implies that the fact that Yuu isn't
laid-back anymore now is because Yuu has found something (or someone in this
case) that she actually cares about (that's why Natsuki mentions how Yuu never
cried or showed emotion when they won or lost a softball match, unlike her
teammates). Then Natsuki says that she just wanted to see Yuu being いっぱいいっぱい
at least once. And at the end Natsuki thinks it's a bit frustrating that Yuu
wasn't いっぱいいっぱい about softball.

That's why I'm confused, the word means something negative and since Yuu is
complaining and judging by her confused reaction it should mean something
negative, but Natsuki talks about this word as it is something positive. I
don't know if I should translate it as "fed up" (negative) or something like
"fulfilled" (positive). I can't get what Natsuki means by using いっぱいいっぱい. I
find the use of 余裕 a bit confusing as well, but I guess both are related in
this case. Thanks in advance.

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Except for when it means the super-literal " **one cup/glass after another**
", 「いっぱいいっぱい / 一杯一杯」 would always hold at least a somewhat **_negative_**
meaning. Those meanings would include:

・ "up to one's neck"

・ "not in the right frame of mind"

・ "swamped"

・ "to have too much on one's plate"

・ "overwhelmed"

Hope you find one of the above fitting in the context this time.

