Is Tali stressed? Or am I having Mom syndrome?

[sunshinenorcas]

So, in the last few weeks I've made a few upgrades for Tali. One, I put her in a larger tank in a new part of my room. Last week, I bought a slim lamp for her tank... it was hard to see one of the thermometers, and I was hoping it'd heat the tank a little so I wouldn't have to run my space heater full blast 24/7 (what I needed to get her tank at the right temp- my room is COLD). And it's worked from what I've seen, the tank feels warmer when I've picked her up or filled water.

New tank is by my TV so I spend a bit of time in front of the tank. Tali has gotten into the habit of 'sitting' by her doors a lot when I'm sitting in my chair, or coming out when I'm in that corner of my room getting dressed (my dresser is on the other side).
Since I got the light, she's much more active and strolls around the tank and checks things out, does the 'sit and watch mom' behavior more. She hasn't hissed, or acted negatively and still uses her hide- I just see her way more often then I used to. She's eaten since I got the new tank, but not since the light.
^editting to add, she hasn't eaten since the light because feeding day hasn't come around since I got the light- I got it tuesday, she eats sunday. sorry! weird phrasing.

Is she just warmer thus, more active with the light? Her hot spot is around 89.2-91. With the light, the tank stays at about... idk. 85-87. If it's off, it's closer to 70-75. I don't want to be stressing her out with the light