I don't think you'll lose too much, don't worry. First of all, we don't just lose weight indefinitely. There's a limit, and our body finds an ideal weight. So it may change 1 or 2kg, but not much more. The other thing is that it may just as easily go up because you'll increase lean mass a little, particularly in the legs, and may find that you sta at 55kg, or even go up. The cellulite issue is not related to exercise- that's the storage of fat, and so that is a different kind of weight gain.
So if you gain weight through diet, then that can (and will) happen, whereas if you do it naturally by exercise, then you won't.
So I'd say give it a try, and see what happens. Don't change the weight training at the same time, but rather give it a month, and then make this call. If you feel you need it then, go for it, and yes, add the weight so that you're lifting just a little heavier, not much though. but step by step - it's impossible to guess exactly how the body will respond, but in general, you should find that you tone, maybe lose a little fat mass, but gain muscle mass. Oh and give this 3 months before you decide, the early changes can be misleading!
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