One of my gerbils squeaks a lot?

[fuzzbutt]

So I have three young gerbils that I adopted at three months old. After a couple of days with them I noticed that one squeaks a lot. It sort of sounds like a bird chirping most of the time through out the day but occasionally it's as if she's in pain but then when I'm handling her she seems fine. 
The other two never make a sound and they don't fight a lot but she is the most submissive.
The only things I can think of is that she is quite (too put it bluntly) a stupid gerbil, she walks into walk, trips over thing, jumps and misses basically just all round misjudging distance which I think could be because she is quite light colour and has red tinted eyes so might not have as good sight as her sisters. Her hearing however is perfectly fine.
The only other reason I can think is she might just be very vocal.

A few things that could be factors but I don't quite know is:
Their cage is in my bedroom where there is normally me and not too loud music playing
They live on the brown carefresh substrate
They are about four or five months old now
They live in the same room as some very loud male rats
They are living in a cage that used to have a lone male gerbil (thoroughly sanitised since then but in the same place)
She is a bar chewer but her teeth seem fine and she is eating properly

If you can think of anything at all it would be great no matter what it is. I would take her to the vet to get checked but there are absolutely no vets in my area that know much about rodents so unless there is something obviously wrong or I go in with some idea they are pretty much useless.

Anyway thank you for your help, I really appreciate it!

[gerbillover9612]

Ive heard that squeaking can sometimes indicate excitement?

[ella]

You say they don't fight a lot, but does it look like the squeaker is bullied? You could add an extra wheel and bottle and scatter feed them to help this. Otherwise, I don't know, sorry.
Bar chewing is really not normal, and you wouldn't expect it if one day your gerbil had a broken tooth and you had no vet to go to. You could just switch to a normal tank.

[fuzzbutt]

I would consider excitement but when I feed her treats and that and her favourite foods now she makes no noise at all. :/ No more than the other submissive, I've never had a trio before and my last gerbil was a lone guy so I'm not used to this, she's the only bar chewer of the three because she doesn't seem to like cardboard.
They all happily eat from the one bowl with no arguments, they do also have a wheel but they don't like it to much...
I really do hate that she does that as I'm terrified of the concept of broken teeth but don't have the room to upgrade them just yet.
Thank you both of you for the input into this, I will test if it could be emotional for longer and maybe the anti bullying thing could be a concern so thank you

[ella]

Hmm...mine sometimes squeak when trying to cram into their nest (because they step on each other).
You could maybe try sticking cardboard into the bars she chews most. Other than that, I don't know. I'm interested to hear your update!

[fuzzbutt]

I have tested several things with her and I believe I have to come to the conclusion that she's just really vocal. Nothing seems to trigger it as sometimes she's in her nest with the other two and others she's just sitting around. Unless anything seems obviously wrong with her I'll just leave her to chirp away for the time being.

[blanknote]

My submissive gerbil is more vocal too, and I don't think there's anything wrong with him. Usually he only squeaks when the gerbils are together in the nest, or the other one is on his way in general, but I'm pretty sure I've heard him make noise when they haven't been that near each other...