Sexual maturity is more to do with SV length than age in Varanids, in one study of this species in Ghana, the females were mature at a ToL of 27cm (10.5inches), so your monitor could quite easily be capable of reproducing at this time, if female.
If you don`t have the means to fully support the monitor, it`s not going to thrive, saying you don`t have anything other than this fish tank, indicates you cannot (good intentions aside, which I`m sure you have)!
If you can put a few pics up, maybe I/we can offer some advise on making it work for a very short time..

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