What type of soil did you repot it into? It looks like it's drying out. Heat and lack of air humidity can do that, other than just not enough water. They need a fast draining soil that's constantly moist. So not waterlogged, nor too dry.

Ahem..... BTW I think you'll find it's Maidenhair ;-)

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If you're growing this indoors, it will be very difficult to keep it happy over the long term because of heat or air conditioning sucking moisture from the air. I had to put mine under a cloche over the winter to keep it from dying. Unless you live in a dry climate, it will be much happier outdoors (in the shade).