Answer:
The subsidiary operates in Thailand simply because its labor costs are much lower. The vast majority of their operations is financed by US dollars that are sent there by the parent company. If the Thai strengthens, then it is more expensive to operate there. I.e. the cheaper a country, the better for the parent company.
In this particular case, the company just obtained a large loan in bahts that it can use to finance its expansion. The thing is that the loan is going to be repaid using US dollars, not Thai bahts. The subsidiary doesn't generate enough bahts to even cover its own expenses, so it will not be able to repay the loan by itself.
If the baht's value increases, then the subsidiary will be hit hard since it will need more US dollars to finance its normal operations and to repay the loan. That will hurt Meinick's value since their cash outflows will increase, reducing its net cash flows.