I think with your tests the past 2 days, it shows pretty clearly that you shouldn't increase the dose. Did you stay with the 2.5u this morning? If I were you, I'd stay with that or if you're following SLGS, reduce by 0.25u. I agree with Sienne about getting at least one test in the pm cycle. From what you have there, it looks like Lucy is very likely one of those kitties that goes low at night. The 115 and the 128 two nights in a row suggest that her lower numbers are at night.
You asked in the subject line about timing of curves . . . what we typically suggest to people is to always get the preshot test in both am/pm, and then get at least one other test in per cycle. It can be as you run out the door to work or as you come in. In the evening, the before-bed test is really important. Because cats so often go low in the pm cycle, it's a critical time to get a test in to help you figure out dosing. As you probably know, Lantus dosing is based upon how LOW the dose causes a cat to go. To some extent, we ignore the high numbers and focus on the lows to determine dosing. Your 70 and 58 the past 2 mornings, at a time when a cat is usually the highest they get to, suggest that Lucy was lower than those numbers in the wee hours of the morning and ROSE to the 70/58 at amps.
It also is helpful if you vary the times you test mid-cycle. I like to think of the spreadsheet as a jig-saw puzzle. If you have only a vertical stripe on each edge (preshot numbers on the ss), you can't really tell too much about what the picture looks like. But if you have a sprinkling of pieces throughout the puzzle in addition to the edge pieces, you can tell very well what the picture is. You don't need every piece, just a sprinkling to be able to see the picture and help you have confidence in making dosing adjustments.
Hope you're doing well! Happy Holidays from us in the US!